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  • A solenoid and a bulb are connected with a ac source . How will the brightness of bulb change if an iron core is inserted in the

A solenoid and a bulb are connected with a ac source . How will the brightness of bulb change if an iron core is inserted in the solenoid?

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As iron is inserted, the magnetic field inside of the solenoid coil  increases. hence, the its inductive reactance increases.

        As X_{L}=L\omega

for inductor, I is equal to  I=\frac{V}{ L\omega }

therefore, current decreases as increase in L and hence brightness of bulb decreases.

 

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avinash.dongre

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