Q120 / 150 · MHT CET 2012 · Physics

A lamp is connected is series with a capacitor and an AC source, what happens if the capacity of the capacitor is reduced?

A
The lamp shines more brightly
Correct answer
B
The lamp shines less brightly
C
There is no change in the brightness of the lamp
D
Brightness may increase or decrease depending on the frequency of the AC

Solution

The lamp shines less brightly because, when capacity of the capaictor is reduced, the capacitive reactance $\left(X_{C}=\frac{1}{\omega C}\right)$ increases and hence, the current through the lamp decreases.

Hence, the correct answer is option: 'B'.

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