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  4. Switch S is closed at t=0 . After sufficiently long time, an iron rod is inserted into the inductor L. Then, the light bulb

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Q. Switch $S$ is closed at $t=0 .$ After sufficiently long time, an iron rod is inserted into the inductor $L$. Then, the light bulbPhysics Question Image

Alternating Current

Solution:

As the rod is inserted, inductance increases and hence the voltage across inductor increases. This causes a drop in the voltage across the bulb and hence it gets dimmer.