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A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections. What happens in each case if the capacitance of the capacitor is reduced?

Answer»

Solution :When a dc 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 ac source, the capacitor offers capacitative REACTANCE (`1//omegaC)` and the current flows in the circuit. Consequently, the lamp will SHINE. Reducing C will increase reactance and the lamp will shine less brightly than before.


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