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

A

an iron rodis inserted in the coil.

B

frequency of the AC sourceis decreased.

C

number of turns in the coil is reduced.

D

a capacitance of reactance $$X_{c}=X_{L}$$ is included in the samecircuit.