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CBSE Class 10 Science Chapter 12 Magnetic Effects of Electric Current Worksheet with Answers

Chapter 12 of NCERT Class 10 Science introduces the fascinating interplay between electricity and magnetism. From Oersted's discovery that current-carrying conductors produce magnetic fields to Faraday's revolutionary work on electromagnetic induction, this chapter forms the backbone of modern electrical engineering. This worksheet provides targeted practice across all difficulty levels, preparing students thoroughly for the CBSE 2025 board exams with questions that mirror the actual paper pattern.

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Key takeaways

✓Covers all NCERT topics: magnetic fields due to current, electromagnetic induction, motors, and generators
✓30+ questions across five sections plus one case-study, matching the latest CBSE Class 10 board exam pattern
✓MCQs test conceptual understanding of right-hand thumb rule, Fleming's left-hand and right-hand rules
✓Short and long answers target 2-mark, 3-mark and 5-mark board exam question styles
✓Detailed answer key with step-by-step explanations ensures effective self-study and revision
✓HOTS questions develop analytical skills for distinguishing AC/DC generators and motor-generator differences
✓Case-study question mirrors the integrated practical scenarios now appearing in CBSE board papers

Quick Chapter 12 Recap: Magnetic Effects of Electric Current

Before attempting the worksheet, revisit these core concepts from NCERT Class 10 Science Chapter 12. A current-carrying conductor generates a magnetic field around it, demonstrated using iron filings or a magnetic compass. The direction of this field is given by the right-hand thumb rule. A solenoid—a coil of many circular turns—behaves like a bar magnet when current flows through it. Electromagnetic induction is the phenomenon where a changing magnetic field induces an electric current in a conductor, forming the basis of generators. An electric motor converts electrical energy into mechanical energy using the force experienced by a current-carrying conductor in a magnetic field, governed by Fleming's left-hand rule. A generator does the reverse—converts mechanical to electrical energy—using Fleming's right-hand rule. Domestic circuits in India supply AC at 220 V, protected by fuses or MCBs.

Magnetic field: Region around a magnet or current-carrying conductor where magnetic force is experienced
Right-hand thumb rule: Thumb shows current direction, curled fingers show magnetic field direction
Fleming's left-hand rule: Used for motors (force direction when current is in a magnetic field)
Fleming's right-hand rule: Used for generators (induced current direction)
Electromagnetic induction: Generation of electric current by changing magnetic field
Solenoid: Coil acting as an electromagnet; field strength increases with more turns or higher current

Worksheet Details: Difficulty Level and Time Allocation

This worksheet is designed for intermediate to advanced Class 10 students who have completed the NCERT chapter reading at least once. The difficulty level is Moderate to Challenging, incorporating questions from previous CBSE board papers and NCERT exemplar problems. Allocate 90 minutes for attempting all sections under exam conditions. Section A and B should take about 20 minutes combined, Section C another 10 minutes, Section D roughly 30 minutes, and Sections E and F the remaining 30 minutes. Use the answer key only after completing your attempt to honestly gauge your preparation level. Mark incorrect answers and revisit those NCERT sections. If you score below 60 percent, consider revisiting the chapter theory and working through NCERT in-text questions before reattempting this worksheet. For students aiming at 95 plus, focus especially on Section E and the case-study question, as HOTS and application-based items differentiate top scorers in the CBSE Class 10 board exam.

Total marks: 50 (approximation for practice purposes)
Suggested time: 90 minutes under timed conditions
Difficulty: Moderate to Challenging—suitable after first reading of NCERT
Scoring guide: 45+ excellent, 35-44 good, 25-34 needs revision, below 25 revisit chapter theory

Section A: Multiple Choice Questions (1 mark each)

Multiple-choice questions form a significant part of the CBSE Class 10 Science board exam, typically carrying 20 marks. This section tests your conceptual clarity and ability to eliminate incorrect options. Read each question carefully, especially terms like 'solenoid', 'magnetic field lines', and 'Fleming's rules'. In the 2024 board paper, students often confused Fleming's left-hand rule with the right-hand rule, losing easy marks. Pay attention to the direction conventions and the specific scenario described. Attempt all six questions and use logical elimination if unsure. Each correct answer earns 1 mark; there is no negative marking in CBSE exams. Cross-check your responses with the answer key provided at the end of this worksheet, and note the explanations for any questions you answered incorrectly. Understanding why an option is wrong is as important as knowing the correct answer, particularly for application-based MCQs that are trending in recent CBSE papers.

Q1. The magnetic field inside a long straight solenoid carrying current: (a) is zero (b) decreases as we move towards its end (c) increases as we move towards its end (d) is the same at all points
Q2. Fleming's left-hand rule is used to find the direction of: (a) induced current (b) magnetic field in a solenoid (c) force on a current-carrying conductor in a magnetic field (d) magnetic field around a straight conductor
Q3. A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each: (a) one revolution (b) half revolution (c) quarter revolution (d) two revolutions
Q4. The device used for producing electric current is called a: (a) generator (b) galvanometer (c) ammeter (d) motor
Q5. The most important advantage of AC over DC is that: (a) AC is safer than DC (b) AC can be transmitted over long distances with less power loss (c) AC is more economical (d) AC can be easily stored
Q6. Two circular coils A and B are placed close to each other. If the current in coil A is changed, the magnetic field in coil B will: (a) increase (b) decrease (c) change (d) remain unchanged

Section B: Fill in the Blanks (1 mark each)

Fill-in-the-blank questions assess your recall of precise terminology and numerical values from NCERT Class 10 Science Chapter 12. In CBSE board exams, these questions usually appear in the objective section and require exact answers without spelling mistakes. The marking scheme is strict—half-spellings or incorrect scientific terms receive zero marks. Write answers in the space provided, focusing on keywords like 'electromagnetic induction', 'solenoid', 'commutator', 'AC generator', and specific names like Oersted, Faraday, or Fleming. Do not use abbreviations unless specifically asked. For instance, write 'alternating current' in full rather than 'AC' unless the blank specifically indicates otherwise. Review your NCERT textbook pages carefully, especially the highlighted definitions and the summaries at the end of Chapter 12. These five questions cover the breadth of the chapter and are designed to reinforce your memory of fundamental concepts and historical contributions to electromagnetism.

Q7. The phenomenon of electromagnetic induction was discovered by ________.
Q8. The direction of magnetic field lines outside a bar magnet is from ________ pole to ________ pole.
Q9. A device that reverses the direction of current through a circuit is called a ________.
Q10. The frequency of AC supplied to households in India is ________ Hz.
Q11. An electric motor converts ________ energy into ________ energy.

Section C: Match the Following and True/False (1 mark each)

This mixed section sharpens your ability to connect concepts and verify factual statements. Match-the-following requires you to pair scientific principles with their applications or inventors with their discoveries. True/False questions test whether you can spot common misconceptions. For example, many students incorrectly believe that magnetic field lines can intersect, or that a DC motor uses slip rings instead of a commutator. In the CBSE 2024 exam, a significant number of students marked 'True' for the statement 'An electric generator works on the principle of electromagnetic force', confusing it with electromagnetic induction. Read each statement twice and visualize the concept before deciding. When matching, first connect the items you are absolutely certain about, then use elimination for the remaining pairs. Write clear answers—match by drawing lines or writing pairs like 'A-3, B-1'. For True/False, simply write T or F; do not leave any question unanswered as there is no negative marking in CBSE Class 10 Science exams.

Section D: Short Answer Questions (2-3 marks each)

Short-answer questions in CBSE Class 10 Science typically carry 2 or 3 marks and require concise, point-wise answers. The examiner looks for specific keywords, correct scientific terminology, and clarity of explanation. Avoid long paragraphs—use bullet points or numbered steps wherever possible. For a 2-mark question, two distinct points or one point with a labeled diagram usually suffice. For 3-mark questions, provide three clear points or a well-explained concept with a supporting example. Practice writing answers within 30-40 words for 2-mark and 50-60 words for 3-mark questions. In Chapter 12, common short-answer topics include explaining Fleming's rules, drawing magnetic field patterns, stating the principle of electromagnetic induction, and listing differences between AC and DC. Always underline key terms like 'electromagnetic induction', 'commutator', 'slip rings', and 'solenoid'. Use diagrams wherever asked—a neat, labeled diagram can fetch you full marks even if the written explanation has minor gaps. The five questions here cover the core NCERT content and mirror past board exam question styles.

Q19. State Fleming's left-hand rule. (2 marks)
Q20. What is electromagnetic induction? Name the scientist who discovered this phenomenon. (2 marks)
Q21. Draw the pattern of magnetic field lines around a current-carrying straight conductor. (2 marks)
Q22. Explain the function of a split ring commutator in an electric motor. (3 marks)
Q23. List three differences between AC and DC generators. (3 marks)

Section E: Long Answer and HOTS Questions (5 marks each)

Long-answer questions are the scoring opportunities in CBSE Class 10 Science board exams, each worth 5 marks. These questions test your depth of understanding, ability to integrate multiple concepts, and skill in structured presentation. A good 5-mark answer should have an introduction, 3-4 body points with explanations or diagrams, and a brief conclusion if relevant. Typically, you should write 80-100 words and include at least one labeled diagram where applicable. HOTS (Higher Order Thinking Skills) questions require analysis, comparison, or application rather than mere recall. For example, explaining why an AC generator produces alternating current involves understanding the rotation of the coil, the changing magnetic flux, and the resulting induced EMF direction changes. In the 2023 CBSE board exam, the 5-mark question on the working of an electric motor carried 2 marks for the diagram alone, so never skip diagrams. Label all parts clearly: armature, brushes, commutator, magnetic field direction, current direction. Use arrows and neat handwriting. The three questions here are designed to push your conceptual boundaries and are often the differentiators between a 90 percent scorer and a 95 percent scorer.

Q24. Describe the working of an electric motor with a neat labeled diagram. (5 marks)
Q25. Explain the principle and working of an AC generator. Why is the current produced called alternating current? (5 marks)
Q26. (HOTS) A coil of insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is: (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii) held stationary inside the coil? Explain your answer citing the principle involved. (5 marks)

Section F: Case-Study Based Question (4 marks)

Case-study questions have become a staple of CBSE Class 10 board exams since 2021, typically carrying 4 or 5 marks. These integrated questions present a real-world scenario or experimental setup, followed by 3-4 sub-questions that test comprehension, application, and analysis. Read the passage carefully—underline key data like current values, number of turns, or directions. The sub-questions may include MCQs, one-word answers, or short explanations. In Chapter 12, case studies often revolve around household electrical safety, working of appliances like electric bells or fans, or experimental demonstrations of electromagnetic induction. The case study below describes a simple experiment similar to those in NCERT in-text activities. Answer each sub-question in the space provided, ensuring you refer back to the passage for specific details. These questions reward careful reading and the ability to connect theory with practical situations. If a case-study question appears in your board exam, tackle it confidently—it is usually easier than it looks and offers an excellent opportunity to score full marks with focused effort.

Answer Key with Explanations

This detailed answer key provides correct responses and brief explanations for every question in the worksheet. Use it only after completing your own attempt to maximize learning. Cross-check your answers carefully, paying attention to keywords and scientific terminology. Award yourself marks honestly and note down the topics where you lost marks for focused revision. If you scored below 60 percent, revisit the relevant NCERT sections and attempt the worksheet again after a few days. If you are consistently scoring above 80 percent, you are well-prepared for this chapter in the board exam. For additional practice and instant doubt-solving with photo-upload support, consider CBSETUTOR.ai—your 24×7 AI tutor available at a flat ₹999 per month for all classes 6 to 12, with a 3-day free trial to get started. The answer key is organized section-wise below, matching the question numbers exactly as they appear in the worksheet. Use the explanations to deepen your conceptual understanding, not just to tick off correct answers. Remember, board exams reward clarity, precision, and the ability to recall and apply concepts under timed conditions.

Section A Answers: Q1-(d) is the same at all points [Magnetic field inside a solenoid is uniform]. Q2-(c) force on a current-carrying conductor in a magnetic field [Fleming's left-hand rule is for motors]. Q3-(b) half revolution [Direction of induced current reverses every 180° rotation]. Q4-(a) generator [Converts mechanical to electrical energy]. Q5-(b) AC can be transmitted over long distances with less power loss [AC voltage can be stepped up or down using transformers]. Q6-(c) change [Changing current in A causes changing magnetic field, inducing current in B via mutual induction].
Section B Answers: Q7-Michael Faraday. Q8-north, south. Q9-commutator (or split-ring commutator). Q10-50 Hz. Q11-electrical, mechanical.
Section C Answers: Match the Following: A-3, B-1, C-2, D-4. True/False: Q16-True [Magnetic field lines never intersect]. Q17-True [Solenoid acts as magnet only when current flows]. Q18-False [Motor and generator work on different principles—motor uses electromagnetic force, generator uses electromagnetic induction].
Section D Answers: Q19-Fleming's left-hand rule: Stretch forefinger (magnetic field direction), middle finger (current direction), thumb (force/motion direction) of left hand mutually perpendicular. Q20-Electromagnetic induction is the phenomenon of generating induced current in a closed coil when magnetic flux through it changes. Discovered by Michael Faraday. Q21-Draw concentric circles around the conductor; arrow shows current direction, circles show magnetic field lines. Q22-Split-ring commutator reverses the direction of current in the motor coil every half rotation, ensuring the coil continues to rotate in the same direction and does not oscillate. Q23-AC generator uses slip rings; DC uses commutator. AC produces alternating current; DC produces direct current. AC generator output voltage varies sinusoidally; DC output is constant (after rectification).
Section E Answers: Q24-Electric motor: Converts electrical energy to mechanical. Principle: Fleming's left-hand rule—force on current-carrying conductor in magnetic field. Construction: coil (armature), magnets, commutator, brushes, battery. Working: current through coil in magnetic field experiences force, coil rotates, commutator reverses current every half turn, continuous rotation achieved. Diagram must show rectangular coil, magnetic poles N-S, commutator split rings, brushes, battery, direction arrows. Q25-AC generator: Converts mechanical to electrical energy. Principle: Faraday's law of electromagnetic induction—changing magnetic flux induces EMF. Construction: rotating coil between magnetic poles, slip rings, brushes. Working: coil rotates, magnetic flux through it changes continuously, induced current direction reverses every half rotation producing alternating current. Diagram must show coil, magnet poles, slip rings, external circuit, direction of rotation. Q26-(i) Magnet pushed in: Galvanometer deflects in one direction due to increasing magnetic flux, induced current opposes the motion. (ii) Magnet withdrawn: Galvanometer deflects in opposite direction, induced current tries to oppose the decrease in flux. (iii) Magnet held stationary: No deflection, no change in flux, no induced current. Principle: Electromagnetic induction (Faraday's law) and Lenz's law.
Section F Answers: Q27-(i) Electromagnetic induction. (ii) Moving magnet changes magnetic flux through the coil, inducing current that causes galvanometer deflection. (iii) Galvanometer shows no deflection because there is no change in magnetic flux when magnet is stationary. (iv) Electric generator, transformer, induction cooktop, or metal detectors (any one valid application).

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Magnetic Effects of Electric Current is one of the scoring chapters in CBSE Class 10 Science, but students often struggle with the three-dimensional visualization of magnetic fields, remembering the correct hand rules, and differentiating between motor and generator operation. CBSETUTOR.ai is your round-the-clock AI tutor that helps you master these challenges. Simply upload a photo of any question from this worksheet or your textbook, and receive step-by-step solutions with diagrams within seconds. Whether you are confused about Fleming's left versus right-hand rule, need help drawing accurate magnetic field line patterns, or want to understand the case-study question in depth, the AI tutor adapts to your learning pace. At a flat ₹999 per month covering all subjects for classes 6 to 12, it is more affordable than a single private tuition session, yet available 24×7. Start with the 3-day free trial to experience instant doubt resolution, personalized practice questions, and chapter-wise mock tests. Thousands of CBSE students across India are already using CBSETUTOR.ai to strengthen their conceptual foundation and boost their board exam scores. The platform is especially helpful for late-night revision, weekend practice, or when you are stuck on a tricky HOTS question and need immediate guidance.

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Tips for Scoring Full Marks in Chapter 12 Questions

Chapter 12 contributed around 6 to 8 marks in the CBSE Class 10 Science board exam 2024, distributed across MCQs, short answers, and one long-answer or case-study question. To maximize your score, first memorize the three key rules—right-hand thumb rule, Fleming's left-hand rule, and Fleming's right-hand rule—and practice applying them to different scenarios. Create flashcards or mnemonic devices to avoid confusion during the exam. Second, practice drawing neat diagrams for magnetic field patterns around a straight conductor, circular loop, and solenoid; magnetic field lines for a bar magnet; and labeled diagrams of motor and generator. Diagrams often carry 2 out of 5 marks in long-answer questions. Third, understand the difference between AC and DC in construction and function, especially the role of commutator versus slip rings. Fourth, revise the numerical values: domestic AC supply in India is 220 V at 50 Hz; magnetic field strength inside a solenoid increases with current and number of turns. Fifth, for case-study questions, underline keywords in the passage and refer back to it while answering sub-questions. Finally, practice previous years' board papers and sample papers to familiarize yourself with question styles and time management. Attempting this worksheet under timed conditions is your first step toward exam readiness.

Memorize and differentiate the three hand rules with visual cues or mnemonics
Practice drawing at least 10 times: solenoid field, motor diagram, generator diagram, magnetic field around conductor
Revise the functions of commutator (motor) versus slip rings (AC generator) thoroughly
Write point-wise answers with underlined keywords for better examiner readability
Solve at least 5 previous years' CBSE board papers focusing on Chapter 12 questions
Time yourself: allocate 1 minute per MCQ, 3-4 minutes per short answer, 8-10 minutes per long answer

Frequently asked questions

What is the weightage of Chapter 12 in CBSE Class 10 Science board exam?+

Chapter 12 Magnetic Effects of Electric Current typically carries 6 to 8 marks in the CBSE Class 10 Science board exam. Questions appear as 1-mark MCQs, 2 or 3-mark short answers, and occasionally a 5-mark long answer or case-study question. The 2024 paper had one 3-mark and one 5-mark question from this chapter.

How do I remember Fleming's left-hand rule and right-hand rule without confusion?+

Associate Fleming's left-hand rule with motors (L for Left, L for motor Load movement) and right-hand rule with generators (R for Right, R for current Rise or generation). Practice by physically using your hands while solving questions. Left hand = force/motion (motor), Right hand = induced current (generator).

Is drawing a diagram compulsory in long-answer questions on motor or generator?+

Yes, diagrams are compulsory and usually carry 2 out of 5 marks in CBSE marking schemes for motor and generator questions. A well-labeled diagram with all components—coil, magnets, commutator/slip rings, brushes, direction arrows—can earn full diagram marks even if the written explanation has minor gaps.

What is the difference between AC and DC generators in terms of construction?+

The key difference is in the current collection mechanism. AC generators use slip rings (two separate continuous rings) that maintain electrical contact throughout rotation, allowing current direction to alternate. DC generators use a split-ring commutator (one ring split into two halves) that reverses connections every half rotation, converting alternating current into direct current in the external circuit.

How many marks are typically allotted to case-study questions in Class 10 Science?+

Case-study questions in CBSE Class 10 Science usually carry 4 or 5 marks, divided into 3 or 4 sub-questions. Each sub-question may be worth 1 or 2 marks. Chapter 12 case studies often involve experimental setups demonstrating electromagnetic induction or practical applications like household electrical safety.

Can I use abbreviations like EMF, AC, DC in my board exam answers?+

Standard scientific abbreviations like AC (alternating current), DC (direct current), EMF (electromotive force), and Hz (hertz) are acceptable in CBSE board exams. However, when first introducing a term, it is good practice to write the full form followed by the abbreviation in brackets, for example electromagnetic induction (EMI), especially in long answers.

What is the function of brushes in an electric motor or generator?+

Brushes are carbon contacts that maintain a continuous electrical connection between the rotating coil (armature) and the external circuit. They press against the commutator or slip rings and allow current to flow in and out of the rotating coil without tangling the wires. Brushes are stationary while the coil rotates.

How should I prepare for HOTS questions from Chapter 12?+

HOTS questions require application and analysis. Practice questions that ask 'why' and 'what if' rather than 'define' or 'state'. For Chapter 12, focus on scenarios involving changing magnetic fields, predicting galvanometer deflections, comparing motor and generator, and explaining Lenz's law. NCERT Exemplar and previous years' board papers are excellent HOTS question sources.

Is it necessary to mention scientists' names like Faraday and Fleming in answers?+

Mentioning scientists' names adds precision and can earn you appreciation marks, especially in 2 or 3-mark questions asking about discoveries or laws. For example, stating 'Electromagnetic induction was discovered by Michael Faraday' is more complete than just 'Electromagnetic induction is the phenomenon...'. However, it is not compulsory unless specifically asked.

How does CBSETUTOR.ai help with difficult Chapter 12 numericals or derivations?+

CBSETUTOR.ai allows you to upload a photo of any question, including diagrams or numerical problems, and receive detailed step-by-step solutions. For Chapter 12, you can clarify doubts about magnetic field direction, apply Fleming's rules to specific scenarios, or understand the working of motors and generators through AI-generated explanations. The 24×7 availability means you get instant help whenever you are stuck, at just ₹999/month for all subjects and classes 6-12, with a 3-day free trial.

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