Questions
Switch S of the circuit shown in fig is closed at t = 0. If e denotes the induced e.m.f. in L and i, the
current flowing through the circuit at time t, then which of the following graphs fig shows the variation of e with i
detailed solution
Correct option is B
When switch S it closed, at that moment the current in the circuit is zero. So, the induced e.m.f. across the inductance is equal to e.m.f. E of the battery. As current increases, the induced e.m.f. in the inductance decreases. If at any instant t, the current in the circuit is i, then applying Kirchhoff's law, we haveiR+e=E or e=(E−iR)So, the graph between e and i will be a straight line having negative slope.Talk to our academic expert!
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In the circuit shown, one of the inductors used is ideal. The potential difference across the batteries is10 V. The current drawn from the battery at steady state, after the switch is closed is
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