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Q.

A bulb connected in series with an air-cored solenoid  is lit by an a.c. source. If a soft iron core is introduced in the solenoid, then 

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a

There is no change in glow of bulb.

b

The bulb stops glowing.

c

The bulb will glow brighter.

d

The bulb will become dimmer.

answer is C.

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Detailed Solution

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V = ZIZ=R2 +  ωL2L=μr μ0 n2 Al

μr  increases  ⇒ L increases  ⇒ Z increases
I  ∝   1Z   ⇒    Bulb goes dimmer

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