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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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answer is 3.

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Detailed Solution

V = ZIZ=R2 + ωL2L=μr μ0 n2 Alμr increases ⇒ L increases ⇒ Z increasesI ∝ 1Z ⇒ Bulb go dimmer

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