In the figure,a lamp P is in series with an i | vedclass

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(B) When the switch $S$ is closed,the current in the circuit starts to increase from zero. As the current changes,a changing magnetic flux is linked w

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the induced $emf$ in $L$

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(B) When the switch $S$ is closed,the current in the circuit starts to increase from zero. As the current changes,a changing magnetic flux is linked with the inductor $L$. According to Faraday's law of electromagnetic induction,this changing flux induces an $emf$ in the inductor. According to Lenz's law,this induced $emf$ opposes the growth of the current in the circuit. Therefore,the current takes some time to reach its steady-state value,causing the lamp $P$ to reach its full brightness slowly.

In the figure,a lamp $P$ is in series with an iron-core inductor $L$. When the switch $S$ is closed,the brightness of the lamp rises relatively slowly to its full brightness compared to the case without the inductor. This is due to:

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