# 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?

A Avinash Dongre

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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