STANDARDPhysics-Electromagnetic Induction
STANDARD Physics Induced EMF MCQ Question
Type: MCQ-numerical-Medium-Class 12
A coil of area 0.4 m² has 100 turns. A magnetic field of 0.04 Wb m⁻² is acting normal to the coil surface. If this magnetic field is reduced to zero in 0.01 s, then the induced emf in the coil is
A
160 V
B
250 V
C
270 V
D
320 V
Correct Answer
Option A
Detailed Explanation
The induced emf is given by Faraday's law: emf = -N(dΦ/dt). Here, Φ = BA = 0.04 • 0.4, and N = 100. The change in flux dΦ = 0.04 • 0.4, and dt = 0.01 s. Thus, emf = 100 • (0.04 • 0.4) / 0.01 = 160 V.
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