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

NEETNEET 2013Alternating Current

Solution:

Brightness of the bulb
• decreases when an iron rod is inserted in the coil as impedance of circuit increases.
• increases when frequency of the AC source is decreased as impedance of circuit decreases.
• Increases when number of turns in the coil is reduced as impedance of circuit decreases.
• increases when a capacitance of reactance $X_C = X_L$ is included in the circuit as impedance of circuit decreases

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