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Question

The resistance in the following circuit is increased at a particular instant. At this instant the value of resistance is 10Ω. The current in the circuit will be now



A
i = 0.5 A
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B
i > 0.5 A
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C
i < 0.5 A
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D
i = 0
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Solution

The correct option is B i > 0.5 A
If resistance is constant (10Ω) then steady current in the circuit i=510=0.5A . But resistance is increasing and it means that current through the circuit starts decreasing. Hence inductance comes in picture which induces a current in the circuit in the same direction of main current. So i>0.5A.

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