Electromagnetic Induction: Class 12 Previous Year Questions

Electromagnetic Induction questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1.  33. (a) State Faraday’s law of electromagnetic induction. 5 (b) Derive an expression for the self-inductance of an air-filled long solenoid of length l and cross-sectional area A having N turns. { } 30  (c) 50 cm          …
   Board 20265 markslong answer
2. State Lenz's law. 24. (a) (b) In the given figure : (i) Identify the machine. (ii) Name the parts P and Q and R of the machine. (ii) Give the polarities of the magnetic poles. (iv) Write the two ways of increasing the output voltage.
   Board 20253 marksshort answer
3. Assertion (A) : The mutual inductance between two coils is maximum when the coils are wound on each other. Reason (R) : The flux linkage between two coils is maximum when they are wound on each other.
   Board 20241 markAssertion-Reason
4. (a) (i) 32. Define coefficient of self-induction. Obtain an expression for self-inductance of a long solenoid of length l, area of cross- section A having N turns. (i) Calculate the self-inductance of a coil using the following data 200 obtained when an AC sou…
   Board 20235 markscase-based
5. Coil 1 has self-inductance L1 which is 3 times the self-inductance L2 of coil 2. If during a certain instant, the rate of increase in current and the power dissipated in these two coils is the same, then determine the ratio of (a) their induced voltages (b) cu…
   CBSE practice 2022-233 marksshort answer
6. I. A bar magnet falls from a height through a metal ring. Its acceleration will be less than ‘g’. Explain. II. A coil of copper wire is wound uniformly on a wooden equilateral triangular frame. If each side of the triangle is increased to 5 times its original …
   Sample paper 2026-273 marksshort answer
7. There is a pair of concentric and coplanar conducting loops of radii R1 and R2 such that R2 = 0.01 R1. To which of the following is the mutual inductance M for this pair directly proportional? A. 1/R12 B. R12 C. 1/R1 D. R1
   CBSE practice 2022-231 markMCQ

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