A light bulb, a capacitor and a battery are connected together as… - Vidyadip

MCQ

A light bulb, a capacitor and a battery are connected together as shown here, with switch $S$ initially open. When the switch $S$ is closed, which one of the following is true

✓
The bulb will light up for an instant when the capacitor starts charging
B
The bulb will light up when the capacitor is fully charged
C
The bulb will not light up at all
D
The bulb will light up and go off at regular intervals

✓

Answer

Correct option: A.

The bulb will light up for an instant when the capacitor starts charging

a
(a) Initially when key is closed, the capacitor acts as short-circuit, so bulb will light up. But finally the capacitor becomes fully charged, so it will act as open circuit, so bulb will not glow.

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