Question: Q. 2. A lamp is connected in series with a capacitor. Predict your observation for $d c$ and $a c$ connections. What happens in each if the capacitance of the capacitor is reduced?
U] [SQP II 2017]
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Solution:
Ans. When a $d c$ source is connected to a capacitor, the capacitor gets charged and after charging, no current flows in the circuit and the lamp will not glow. There will be no change even if $C$ is reduced. With an $a c$ source, the capacitor offers capacitive reactance and the current flows in the circuit. Consequently the lamp will shine. Reducing $C$ will increase the reactance and the lamp will shine less brightly than before.
2
[CBSE Marking Scheme 2017]
