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Question

In the figure, the switch S is closed so that a current flows in the iron-core inductor which has inductance L and the resistance R. When the switch is opened, a spark is obtained in it at the contacts. The spark is due to


A
a slow flux change in L
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B
a sudden increase in the emf of the battery B
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C
a rapid flux change in L
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D
a rapid flux change in R
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Solution

The correct option is C a rapid flux change in L
When switch S is closed, we see that the current flows through the circuit and there will be energy stored in the inductor. When switch S is opened, the voltage drop across the resistance will instantly come to zero, but in the inductor, there will be some energy and due to that a rapid flux change occurs in L.
ϕ=LI

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