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A small signal voltage sin is applied across an ideal capacitor
(a)
Current , lags voltage by
(b)
Over a full cycle the capacitor does not consume any energy from the voltage source.
(c)
Current is in leads voltage by
(d)
Current leads voltage by

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Important Questions on Alternating Current
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Which of the following combinations should be selected for better tuning of an circuit used for communication?

EASY
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The potential differences across the resistance, capacitance and inductance are and , respectively in an circuit. The power factor of this circuit is,

HARD
NEET
IMPORTANT
A series L-C-R circuit R = 10 k, L = 20mH, C = 5µF is connected to AC source V = 10sint. Find out band width of signal :

MEDIUM
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IMPORTANT
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IMPORTANT
A RC series circuit of R = 15 and C = 10 µF is connected to 20 volt DC supply for very long time. Then capacitor is disconnected from circuit and connected to inductor of 10 mH. Find amplitude of current.

HARD
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IMPORTANT
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HARD
NEET
IMPORTANT
In the circuit shown, switch is connected to position 1 for a very long time. What is maximum current through inductor when switch is taken to position 2 ?

MEDIUM
NEET
IMPORTANT
A coil has resistance of and an inductance of . It is connected to an AC source of . The average power consumed in the circuit is,
