First slide

Phasors and Phasor Diagrams

Question

A bulb and a capacitor are in series with an AC source. On increasing frequency, how will glow of the bulb change?

Moderate

A

The glow decreases.
B

The glow increases.
C

The glow remain the same.
D

The bulb quenches.

Solution

When frequency v is increased, the capacitive reactance, $X_{C} = \frac{1}{2 πvC},$ decreases and hence the current through the bulb increases. This will increase the brightness of the bulb.

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