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An air coil solenoid is connected to an ...

An air coil solenoid is connected to an a.c. sources and a bulb. If an iron core is insernted in the solenoid, how does the brightness of the bulb change? Give reason for your answer.

Text Solution

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We know, inductive reactance, `X_L = omegaL = 2pivL`
When soft iron core is introduced in the solenoid, the value of L increases. Hence inductive reactance `X_L` will also increase. Since the effective opposition (reactance) offered by the solenoid increases, so the current through it will decrease. Therefore the bulb will glow dimmer.
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