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Physics-Faraday's Laws

NEET Physics Faraday's Laws MCQ Question

Type: MCQ-numerical-Medium-Class 12

A coil with 10 turns is placed in a uniform magnetic field perpendicular to its plane. If the magnetic flux through one turn changes from 0.5 Wb to 0.3 Wb in 2 seconds, what is the magnitude of the induced emf in the coil?

A

1 V

B

2 V

C

3 V

D

4 V

Correct Answer

Option A

Detailed Explanation

The induced emf is calculated using Faraday's law: ε=−NdΦdt\varepsilon = -N \frac{d\Phi}{dt}. Here, N=10N = 10, dΦ=0.3−0.5=−0.2d\Phi = 0.3 - 0.5 = -0.2 Wb, and dt=2dt = 2 s. Thus, ε=−10×−0.22=1\varepsilon = -10 \times \frac{-0.2}{2} = 1 V.

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