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A coil and an electric bulb are connecte...

A coil and an electric bulb are connected in series with an ac. Source. On introducing a soft iron bar inside the coil, the intensity of the bulb will

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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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