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Class 12 Physics: Electromagnetic Induction
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MCQs on faraday and henry experiments, magnetic flux, induction faradays law, lenz law, energy conservation, motional electromotive force, energy consideration quantitative study, eddy currents and inductance.

Class 12 Physics: Electromagnetic Induction
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25 Questions

1. A bar of length 2m is said to fall freely in a magnetic field of magnitude 50 T. What is the motional emf in the bar when it has fallen 40 meters?
2. Identify the type of commercial motor which works as a consequence of eddy currents.
3. Identify the correct dimensions of magnetic flux.
4. Faraday's laws are result of the conservation of which quantity?
5. How can electromagnetic damping be increased?
6. Eddy currents can be used to heat localized tissues of the human body. What is this branch of science referred to as?
7. In the second experiment, Faraday replaced 'X' with 'Y' for checking the deflection in the galvanometer. Identify X and Y.
8. Which of the following is a unit of magnetic flux?
9. Which law is used in finding the direction of current in an a.c. generator?
10. What is proportional to the magnitude of the induced emf in the circuit?
11. Pick out the expression for power in a rectangular conductor from the following.
12. A circular coil having an area of 3.14 × 10-2 m2 and 30 turns is rotated about its vertical diameter with an angular speed of 70 rad-1 in a uniform horizontal magnetic field of magnitude 5 × 10-2 T. If the coil forms a closed loop of resistance 15 Ω, what is the average power loss due to Joule heating?
13. A bar of length 0.15 m slides along metal rails at a speed of 5 m/s. The bar and rails are in a magnetic field of 40 T, pointing out into the page. The resistance of two resistors in parallel is both 20 Ω, and the resistance of the bar is 5 Ω. What is the current in the bar?
14. Calculate the mutual inductance between two coils if a current 10 A in the primary coil changes the flux by 500 Wb per turn in the secondary coil of 200 turns.
15. The magnetic flux in a closed circuit of resistance 20 Ω varies with time t as Φ = 4t3 + 2t2 – 15t + 3. Calculate the magnitude of induced emf at t = 1s.
16. Identify the significance of energy consideration from the following.
17. Identify the law used to find the direction of eddy currents.
18. Identify the expression for the motional electromotive force from the following?
19. Lenz's law is invalid. State true or false.
20. Which of the following statement is valid?
21. Which of the following is found using Lenz's law?
22. A bar of length 0.7 m slides along metal rails at a speed of 1 m/s. The bar and rails are in a magnetic field of 20 T, pointing out into the page. Calculate the motional emf.
23. Which of the following is not an application of eddy currents?
24. Identify the factor on which mutual inductance does not depend.
25. Which among the following affects the deflection in the galvanometer?

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