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Q.

A series R-C circuit is connected to an alternating voltage source. Consider two situations:(a) When capacitor is air filled.(b) When capacitor is mica filled. Current through resistor is i and voltage across capacitor is V then

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a

ia>ib

b

Va=Vb

c

Va

d

Va>Vb

answer is D.

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Detailed Solution

Current through resistor, i = Current in the circuit =V0R2+XC2=V0R2+(1/ωC)2 Voltage across capacitor, V=iXC=V0R2+(1/ωC)2×1ωC=V0R2ω2C2+1 As CaVb
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