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A choke coil is in series with a lamp. The lamp is shining brightly

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If the power supply is DC and an iron core is inserted inside the coil, the lamp becomes brighter

If the power supply is AC and an iron core is inserted inside the coil, the lamp becomes brighter.

If the power supply is DC and an iron core is inserted inside the coil, the lamp gives same amount of light.

If the power supply is AC and an iron core is inserted inside the coil, then lamp becomes dimmer

answer is C, D.

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Detailed Solution

Insertion of iron core increases the inductance. In AC circuit, this increases the impedance and the current falls. The bulb becomes less bright.

In DC circuit, after the transient phase, an inductor has no effect on the current value

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