A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when:

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A capacitance of reactance $X_{c} = X_{L}$ is included in the same circuit.

An iron rod is inserted in the coil.

Frequency of the AC source is decreased.

Number of turns, in the coil is reduced.

answer is D.

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Detailed Solution

$V_{L} = {iX}_{L}; X_{L},$ when iron rod is inserted in the coil, inductance is increased and voltage drop across inductance increase.

Due to increase in voltage drop across inductance, voltage drop across bulb decreases and hence brightness of bulb is reduced.

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