STANDARDPhysics-Electromagnetic Induction
STANDARD Physics Faraday's Law MCQ Question
Type: MCQ-numerical-Medium-Class 12
The magnetic flux through a coil perpendicular to its plane and directed into paper is varying according to the relation ϕ = (2t² + 4t + 6) mWb. The emf induced in the loop at t = 4 s is
A
0.12 V
B
2.4 V
C
0.02 V
D
1.2 V
Correct Answer
Option C
Detailed Explanation
Given, ϕ = (2t² + 4t + 6) mWb. The emf ε = dϕ/dt = (4t + 4) × 10⁻³ V. At t = 4 s, ε = (4 × 4 + 4) × 10⁻³ V = 20 × 10⁻³ V = 0.02 V.
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