Two coils have a mutual inductance of 0.20 H. The current in the first coil changes at 50 A/s. What emf is induced in the second coil?
Correct answer B. 10 V
Explanation
Induced emf in the secondary ε = M ΔI/Δt = 0.20 H × 50 A/s = 10 V. This mutual induction is the principle on which a transformer works.
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