NEET Physics Faraday's Laws MCQ Question
A coil with 50 turns is placed in a uniform magnetic field that decreases from 0.8 T to 0.2 T in 0.1 seconds. If the area of the coil is 0.02 m² and the field is perpendicular to the plane of the coil, what is the magnitude of the induced emf?
6.0 V
5.0 V
0 V
0 V
Correct Answer
Detailed Explanation
Using Faraday's law, the induced emf is ε = -N(dΦ/dt), where N is the number of turns, and Φ is the magnetic flux. The change in flux dΦ = A(dB) where dB is the change in magnetic field. Therefore, ε = -50 * 0.02 * ((0.2 - 0.8)/0.1) = 6.0 V.
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