Physics · Electromagnetic Induction
A 10 Ω, 20 mH coil carrying a constant current is connected to a battery of 20 V through a switch. If the switch is opened and the current becomes zero in 100 μs, the average e.m.f. induced in the coil is ______ V.
- 1800
- 2100
- 3400✓
- 4200
Correct answer
400
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