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A coil of self-inductance 0.5 H carries 4 A which is switched off uniformly in 0.1 s. What average emf is induced?
A8 V
B0.2 V
C20 V
D2 V
Answer & Solution
Correct answer: C. 20 V
emf = L x change in current / time = 0.5 x 4 / 0.1 = 20 V.
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