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  • A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the ind

A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the inductor. The glow of the light bulb

 

Option: 1

remain unchanged


Option: 2

will fluctuate


Option: 3

increases

 


Option: 4

decreases


Answers (1)

best_answer

L = \frac{\mu _0 N^2(\pi r^2)}{l}

After inserting the iron rod

L_{final} = \frac{\mu N^2(\pi r^2)}{l}                                \mu > \mu_0

e= -L\left ( \frac{di}{dt} \right )

As L increases, emf induced across the inductor will increase leaving less voltage across the bulb. Therefore, the glow of the light bulb decreases.

Posted by

jitender.kumar

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