The induced emf can be produced in a coil by A. moving the coil with… | JEE Main 2023 (6 Apr, Shift 1)

Q44JEE Main 2023 · 6 APR · SHIFT 1Easy

Magnetic Flux & Faraday's Law

The induced emf can be produced in a coil by

A. moving the coil with uniform speed inside uniform magnetic field

B. moving the coil with non uniform speed inside uniform magnetic field

C. rotating the coil inside the uniform magnetic field

D. changing the area of the coil inside the uniform magnetic field

Choose the correct answer from the options given below:

Show answer and solution

Answer: (b)

An emf is induced only if the flux $BA\cos\theta$ changes.
A, B: moving the coil (uniform or non-uniform speed) inside a uniform field keeps $\Phi$ constant, so no emf.
C: rotation changes $\theta$ , so $\Phi$ changes. D: changing $A$ changes $\Phi$ .
So the answer is (b) C and D only.

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