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In the circuit shown, the value of capacitive reactance XC if net current (l) is in phase with the applied voltage (V) is nearly

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Important Questions on Alternating Current

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JEE Main/Advance
IMPORTANT

In the given AC circuit, capacitance C is adjustable. For what value of C, the current amplitude is maximised?

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JEE Main/Advance
IMPORTANT

A capacitor is charged and connected to an ideal inductor as shown. If switch S is closed at t=0, which of the following graphs represents, magnetic energy U in the inductor as a function of time?

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JEE Main/Advance
IMPORTANT

In a series LCR circuit VL=3VR and VC=2VR Voltage across capacitance

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JEE Main/Advance
IMPORTANT
The primary coil of an ideal transformer has 100 turns and the secondary coil has 600 turns. Then
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JEE Main/Advance
IMPORTANT
The p.d. across an instrument in an AC circuit of frequency f is V and the current flowing through it is I such that V=5cos2πft volt and I=2sin(2πft) amp. The power dissipated in the instrument is:
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JEE Main/Advance
IMPORTANT
An RLC series circuit is driven by a sinusoidal emf with angular frequency ω. If ω is increased without changing the amplitude of the emf the current amplitude increases. It means
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JEE Main/Advance
IMPORTANT
A sinusoidal AC voltage V=10sin(100πt) is rectified by a full wave rectifier. The frequency (in Hz ) of rectified voltage is_____
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JEE Main/Advance
IMPORTANT

For the circuit shown below, the current through the inductor is 0.6 A, while current through the capacitor is 0.4 A. The current (in A) drawn from the source is _____

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