A coil of self-inductance L is connected...

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

Frequency of the AC source is decreased

Number of turns in the coil is reduced

A capacitance of reactiance `X_(C)= X_(L)` is included in the same circuit

An iron rod is inserted in the coil

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