A 100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

(a) 2.2 A              (b) 11A

(c) 4.4A               (d) 112A

Concept Questions :-

Different types of AC Circuits
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A small-signal voltage V(t)=Vo sinωt is applied across an ideal capacitor C 
(a) over a full cycle, the capacitor C does not consume any energy from the voltage         source
(b) current I(t) is in phase with voltage V(t)
(c) current I(t) leads voltage V(t) by 180°
(d) current I(t) lags voltage V(t) by 90°

Concept Questions :-

Rms and average values
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An inductor 20 mH, a capacitor 50μF, and a resistor 40Ω are connected in series across a source of emf V=10sin340t. The power loss in the AC circuit is:

 

1. 0.67 W

2. 0.78W

3. 0.89 W

4. 0.46 W

Concept Questions :-

Different types of AC Circuits
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A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z' the power drawn will be:

1. PRZ22. PRZ3. PRZ4. P 



Concept Questions :-

Different types of AC Circuits
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A series R-C circuit is connected to an alternating voltage source. Consider two situations:

1. When the capacitor is air-filled.

2. When the capacitor is mica filled.

Current through the resistor is I and voltage across the capacitor is V then

(a)Va<Vb

(b)Va>Vb

(c)ia>ib

(d)Va=Vb

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A coil of self-inductance L is connected in series with a bulb B and an AC source. The brightness of the bulb decreases when

(a) frequency of the AC source is decreased 

(b) the number of turns in the coil is reduced

(c) a capacitance of reactance Xc=XL is included in the same circuit

(d) an iron rod is inserted in the coil


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In an electrical circuit R, L, C, and an AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead, C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is

(a) 1/2                                           

(b) 1/2

(c) 1                                             

(d) 3/2

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The instantaneous values of alternating

current and voltages in a circuit are given

as 

i=12sin(100πt) amperee=12sin(100πt+π/3) volt

The average power in Watts consumed in the

circuit is

(a) 14

(b) 34

(c) 12 

(d) 18

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In a coil of resistance 10Ω, the induced

current developed by changing magnetic

flux through it is shown in the figure as a 

function of time. The magnitude of change

in flux through the coil in weber is-

(a) 8

(b) 2

(c)6

(d)4

Concept Questions :-

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In an AC circuit an alternating voltage e=200 2 sin 100t volt is connected to a capacitor 1 μF. The rms value of the current in the circuit is

(a) 100 mA

(b) 200 mA

(c) 20 mA

(d) 10 mA

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