Electromagnetic Induction Class 12 Physics PYQs 2026-27 | Chapter 6

CBSE Class 12 Physics · Chapter 6 · 2026–27

Electromagnetic Induction Class 12 Physics PYQs

Selected and research-audited Chapter 6 Previous Year Questions with answer keys, solution approaches and topic mapping for CBSE Class 12 Physics. Covers Faraday’s law, Lenz’s law, magnetic flux, induced EMF, motional EMF, self-induction and mutual induction.

Important authenticity note: This page distinguishes PYQ records cross-checked against established chapterwise PYQ indexes and the official CBSE paper archive from original solution wording. Question statements are selectively paraphrased for copyright-safe study use rather than reproduced as long verbatim passages. For official paper files and exact set-wise wording, use the CBSE Previous Years’ Question Papers archive.

Current 2026–27 syllabus boundary: Chapter 6 covers electromagnetic induction, Faraday’s laws, induced EMF/current, Lenz’s law, self-induction and mutual induction. AC generator and transformer are listed in Chapter 7: Alternating Current. They are therefore not treated as Chapter 6 core PYQs on this page. Check the official CBSE Physics 2026–27 curriculum.

1-Mark PYQs2-Mark PYQs3-Mark PYQs 4-Mark Case Studies5-Mark PYQsRepeated PYQ Patterns How to Use PYQsChapter 6 Resources

1. 1-Mark Electromagnetic Induction PYQs

These short Class 12 Physics Chapter 6 PYQs focus on the concepts that repeatedly appear in board-style practice: magnetic flux, Faraday’s law, Lenz’s law, induced charge, self-inductance, mutual inductance and flux-change reasoning. Current chapterwise PYQ indexes show EMI questions across recent CBSE papers, including 2021–2025, while broader 2003–2026 compilations organise the chapter by 1-, 2-, 3-, 4- and 5-mark questions. The questions below are paraphrased from those indexed PYQ records and should be cross-checked against the official paper archive for exact set-wise wording.

20251 MarkMCQ

PYQ 1 · 2025

Question: A 300-turn circular coil is placed with its plane perpendicular to a magnetic field. The field falls uniformly to zero in 20 ms and then rises uniformly to its original value in 40 ms. Compare the magnitudes of the two induced emfs.

Answer / Key result: 2 : 1

Solution approach: For the same N and area, average emf is proportional to |ΔB|/Δt. The second interval takes twice as long for the same field change, so e₁/e₂ = 2.

20251 MarkMCQ

PYQ 2 · 2025

Question: A coil initially has no linked magnetic flux and is suddenly placed in a uniform magnetic field. Determine the charge induced through the coil in terms of turns, flux change and resistance.

Answer / Key result: NΔΦ/R

Solution approach: Using q = IΔt and Faraday’s law, q = N|ΔΦ|/R for a simple closed circuit of constant resistance.

20251 MarkAssertion–Reason

PYQ 3 · 2025

Question: A closed coil carrying induced current can experience a force opposing the motion that changes its flux. The reason is that the induced effect opposes the change in flux.

Answer / Key result: A

Solution approach: Both statements are true and the Reason correctly explains the Assertion through Lenz’s law and energy conservation.

20251 MarkMCQ

PYQ 4 · 2025

Question: A rotating loop has its magnetic flux expressed as a sinusoidal function of time. Identify the corresponding qualitative behaviour of induced emf.

Answer / Key result: Negative time derivative of the flux

Solution approach: Faraday’s law gives ε = −dΦ/dt, so the emf is the negative time derivative of the flux.

20241 MarkMCQ

PYQ 5 · 2024

Question: Two coils have mutual inductance M. If the current in the primary changes at a specified rate and the secondary emf is given, determine M.

Answer / Key result: M = |ε₂|/|dI₁/dt|

Solution approach: From |ε₂| = M|dI₁/dt|, mutual inductance is the induced emf divided by the rate of change of primary current.

20241 MarkMCQ

PYQ 6 · 2024

Question: A square coil of 100 turns is placed perpendicular to a magnetic field whose magnitude increases uniformly. Find the induced emf from the given side length and rate of change of B.

Answer / Key result: ε = NA(dB/dt)

Solution approach: Since the area vector is parallel to B, Φ = BA and |ε| = NA|dB/dt|.

20241 MarkMCQ

PYQ 7 · 2024

Question: For a coil with a changing magnetic flux, determine the instantaneous induced emf from a given flux-versus-time expression.

Answer / Key result: ε = −dΦ/dt

Solution approach: Differentiate the given flux with respect to time and apply Faraday’s law; the sign gives direction relative to the chosen loop orientation.

20241 MarkMCQ

PYQ 8 · 2024

Question: A coil is rotated so that the angle between the magnetic field and its area vector changes. Determine how the flux changes.

Answer / Key result: Φ = BA cosθ

Solution approach: The angle in the flux formula is measured from the area vector, not from the plane of the coil.

20231 MarkMCQ

PYQ 9 · 2023

Question: A conducting loop enters, moves through and leaves a region of uniform magnetic field. Identify the intervals during which induced emf is present.

Answer / Key result: During entry and exit, not during uniform-flux motion

Solution approach: Induced emf occurs only while the magnetic flux through the loop is changing.

20231 MarkMCQ

PYQ 10 · 2023

Question: Two coils have a known flux-current graph for one coil producing flux through the other. Determine their mutual inductance from the graph.

Answer / Key result: M = ΔΦ/ΔI

Solution approach: Mutual inductance is obtained from flux linkage per unit current, with turns accounted for according to the graph’s definition.

20231 MarkMCQ

PYQ 11 · 2023

Question: A magnet approaches a conducting coil. Determine the direction of the induced current using Lenz’s law.

Answer / Key result: The induced field opposes the increase in flux

Solution approach: Identify the external flux change, then choose the current direction whose magnetic field opposes that change.

2. 2-Mark PYQs

20222 MarksNumerical

PYQ 12 · 2022

Question: A 600-turn solenoid has self-inductance 108 mH. A similar solenoid has 500 turns with the same length, radius and medium. Find its self-inductance.

Answer / Key result: 75 mH

Solution approach: For the same geometry and medium, L ∝ N². Thus L₂ = 108(500/600)² = 75 mH.

20222 MarksNumerical

PYQ 13 · 2022

Question: The primary current of a pair of coils falls from 7 A to 3 A in 0.04 s. If M = 0.5 H, find the magnitude of induced emf in the secondary.

Answer / Key result: 50 V

Solution approach: |ε₂| = M|ΔI₁|/Δt = 0.5×4/0.04 = 50 V.

20222 MarksNumerical

PYQ 14 · 2022

Question: A coil of area 100 cm² is held at 30° to a magnetic field of 0.1 T, and the field falls to zero in 10⁻⁴ s. Find the average induced emf using the angle convention specified in the original paper.

Answer / Key result: Use |εavg| = N|ΔΦ|/Δt with Φ = BA cosθ

Solution approach: This is a classic angle-convention check. Confirm whether the stated angle is with the area vector or the plane in the original paper/diagram before substituting.

3. 3-Mark PYQs

20213 MarksDerivation

PYQ 15 · 2021

Question: Obtain the self-inductance of a long solenoid in terms of permeability, number of turns, cross-sectional area and length.

Answer / Key result: L = μN²A/l

Solution approach: Use B = μNI/l, find flux through one turn, calculate flux linkage NΦ, then use L = NΦ/I.

20213 MarksConceptual

PYQ 16 · 2021

Question: Explain why a changing current in a primary coil induces emf in a nearby secondary coil, and state the relation connecting emf with mutual inductance.

Answer / Key result: ε₂ = −M dI₁/dt

Solution approach: Changing primary current changes magnetic flux linked with the secondary; the induced emf follows Faraday’s law.

20203 MarksNumerical

PYQ 17 · 2020

Question: A coil’s magnetic flux varies with time according to a specified function. Determine the induced emf at a stated instant.

Answer / Key result: ε = −dΦ/dt

Solution approach: Differentiate the flux function and substitute the requested time; the sign gives direction.

20203 MarksConceptual

PYQ 18 · 2020

Question: A conducting rod moves through a uniform magnetic field. Obtain the standard motional-emf relation for a rod of length l moving perpendicular to B with speed v.

Answer / Key result: ε = Blv

Solution approach: Magnetic force separates charges until electric and magnetic forces balance, producing the potential difference Blv.

20193 MarksNumerical

PYQ 19 · 2019

Question: The self-inductance of a solenoid changes when its number of turns is altered while length, area and medium remain unchanged. Determine the scaling relation.

Answer / Key result: L ∝ N²

Solution approach: From L = μN²A/l, doubling N makes L four times for fixed geometry and medium.

20193 MarksConceptual

PYQ 20 · 2019

Question: A magnet is moved toward and then away from a conducting loop. Compare the induced-current directions in the two cases.

Answer / Key result: They reverse

Solution approach: Reversing the direction of the flux change reverses the induced emf/current direction.

20183 MarksNumerical

PYQ 21 · 2018

Question: A current in one coil changes uniformly and induces a known emf in another coil. Determine the mutual inductance.

Answer / Key result: M = |ε|Δt/|ΔI|

Solution approach: Use |ε| = M|ΔI/Δt| and solve for M.

20183 MarksGraph

PYQ 22 · 2018

Question: A flux-time graph consists of straight-line segments. Determine the induced-emf magnitude in each segment.

Answer / Key result: Magnitude equals the absolute Φ–t slope multiplied by N

Solution approach: For each segment calculate |dΦ/dt|; a steeper flux-time slope means larger induced emf.

4-Mark Case-Based PYQs

20234 MarksCase Study

PYQ 27 · 2023

Question: A case study describes a changing magnetic field and asks about induced emf, current direction and the role of Lenz’s law.

Answer / Key result: Use Faraday’s law for magnitude and Lenz’s law for direction

Solution approach: Separate magnitude from direction: rate of flux change gives emf; the opposition rule gives current direction.

20244 MarksCase Study

PYQ 28 · 2024

Question: A case study involving two coils asks how a changing primary current affects the secondary and how mutual inductance enters the calculation.

Answer / Key result: ε₂ = −M dI₁/dt

Solution approach: The secondary emf is produced because the primary’s changing current changes the flux linkage of the secondary.

20254 MarksCase Study

PYQ 29 · 2025

Question: A case study involves a magnet/ring system and asks why motion is opposed while current is induced.

Answer / Key result: Lenz’s law + energy conservation

Solution approach: The induced current creates a magnetic effect that opposes the change causing it; external mechanical work is converted into electrical/thermal energy.

5-Mark PYQs & Integrated Questions

20255 MarksLong Answer

PYQ 23 · 2025

Question: A multi-part board question combines Faraday’s laws, self-inductance and a motional-emf application. State the governing laws and solve each sub-part from the supplied data.

Answer / Key result: Use Faraday: ε = −N dΦ/dt; self-induction: ε = −L dI/dt; motional emf: ε = Blv

Solution approach: Keep each physical mechanism separate, write the governing equation first, use SI units, and state direction where required.

20255 MarksLong Answer

PYQ 24 · 2025

Question: A question combines Lenz’s law with conservation of energy and a numerical application involving induced current.

Answer / Key result: Induced effect opposes the change; external mechanical work supplies the transferred energy

Solution approach: Lenz’s law fixes direction and is consistent with energy conservation; then use Faraday’s law and circuit relations.

20245 MarksLong Answer

PYQ 25 · 2024

Question: A question asks for the principle and derivation of self-inductance of a long air-core solenoid, followed by a numerical/application.

Answer / Key result: L = μ₀N²A/l

Solution approach: Derive B inside the solenoid, find flux per turn and flux linkage, then use L = NΦ/I.

20245 MarksLong Answer

PYQ 26 · 2024

Question: A mutual-induction problem gives the change in primary current and induced emf and asks for mutual inductance or a related induced-charge quantity.

Answer / Key result: M = |ε₂|Δt/|ΔI₁|; q = N|ΔΦ|/R when applicable

Solution approach: Choose the relation matching the quantity asked; do not confuse mutual inductance with self-inductance.

20265 MarksLong Answer

PYQ 30 · 2026

Question: Recent board-oriented Chapter 6 records include magnetic-flux/vector-area reasoning, rotating-loop emf, flux/emf graphs, rotating-rod motional emf and mutual-inductance applications.

Answer / Key result: Apply Φ = B·A, ε = −N dΦ/dt, ε = Blv or ε = ½Bωl² as appropriate, and ε₂ = −M dI₁/dt

Solution approach: Identify the physical mechanism first. Recent 2026 PYQ compilations report these tested themes; verify exact wording and set against the official paper before presenting any item as verbatim.

6. What Repeats Across Chapter 6 PYQs?

The strongest recurring Electromagnetic Induction PYQ themes are not limited to one formula. Board questions repeatedly test whether you can connect flux change to induced EMF, use Lenz’s law for direction, and move between numerical, graph and application forms. This makes the following concept map more useful than memorising isolated answers.

High-frequency theme	Typical PYQ task	What to master
Magnetic flux	Calculate Φ or compare flux after orientation/field changes.	Φ = B·A = BA cosθ and the area-vector angle convention.
Faraday’s law	Find average/instantaneous induced emf or interpret a flux-time graph.	|ε| = N|ΔΦ|/Δt and ε = −N dΦ/dt.
Lenz’s law	Determine induced-current direction or explain opposition to motion.	Opposition to the change in flux; energy conservation.
Motional EMF	Moving rod, rotating rod or mechanical-motion application.	ε = Blv and the geometry/sign convention.
Self-induction	Solenoid inductance, scaling with turns, or induced emf.	L = μN²A/l and ε = −L dI/dt.
Mutual induction	Calculate M or secondary induced emf from primary current change.	ε₂ = −M dI₁/dt and flux linkage.
Induced charge	Find total charge transferred for a known change in flux.	q = N|ΔΦ|/R for a simple constant-R circuit.
Graphs	Convert Φ–t, B–t or I–t information into emf/current behaviour.	Derivative/slope reasoning and piecewise intervals.

7. How to Use Chapter 6 PYQs for Board Preparation

1. Solve before reading
Hide the answer and attempt the question under a realistic time limit.

2. Tag the mechanism
Write F (Faraday), L (Lenz), M (motional), S (self-induction) or MI (mutual induction) beside each mistake.

3. Re-solve mistakes
After checking the solution, close the page and reproduce the equation, substitution and final unit yourself.

8. PYQ Quality & Source Note

Source hierarchy used for this page:

1. Official CBSE archive: the final authority for exact paper, year, set and wording.
2. Established chapterwise PYQ indexes: used to discover recurring Chapter 6 questions and topic patterns efficiently.
3. Learn Revise Hub explanations: original solution approaches written for revision and concept clarity.

Important: A question shown here is a PYQ record/paraphrase, not a claim that the displayed wording is the verbatim text of a particular CBSE set. Students who need exact wording should open the official paper archive and match the year/set before quoting the question in notes.

9. High-Value Chapter 6 PYQ Checklist

Faraday + flux
Be able to move between Φ = BA cosθ, ΔΦ/Δt and induced emf for both numerical and graph questions.

Lenz + direction
Identify the change in flux first; only then determine the direction of the induced magnetic effect/current.

Inductance
Know the difference between self-inductance L and mutual inductance M, including their units and induced-emf relations.

Motional EMF
Recognise when a moving conductor produces ε = Blv and when a rotating conductor requires a different geometry-based expression.

Graph questions
For a Φ–t graph, the slope gives the induced-emf magnitude after applying Faraday’s law and the turns factor.

Exam discipline
Write the governing law first, keep SI units consistent, show substitutions and justify direction separately from magnitude.

10. Chapter 6 Study Resources

Chapter 6 Complete Notes Chapter 6 Important Questions Chapter 6 MCQs Chapter 6 Numericals Chapter 6 Case-Based Questions Chapter 6 Assertion–Reason Chapter 5 Notes — Previous Chapter CBSE Class XII 2026–27 SQP & Marking Scheme

How to use these PYQs: Start with the questions you find difficult, then revisit the relevant concept in the Chapter 6 notes. Pay special attention to magnetic flux, Faraday’s law, Lenz’s law, motional EMF, self-induction and mutual induction. For numerical questions, write the governing formula first, keep SI units consistent, and show the main substitution steps.