NEET Physics Faraday's Laws MCQ Question
A coil of 200 turns is placed in a magnetic field that changes its magnitude from 0.5 T to 0.1 T in 0.2 seconds. The area of the coil is 0.3 m², and the field is perpendicular to the plane of the coil. What is the magnitude of the induced emf in the coil?
12 V
6 V
24 V
18 V
Correct Answer
Detailed Explanation
Using Faraday's law, the induced emf is ε = -N * ΔΦ/Δt. The change in flux ΔΦ = A * ΔB = 0.3 m² * (0.1 T - 0.5 T) = -0.12 Wb. Thus, ε = 200 * 0.12 Wb / 0.2 s = 24 V.
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