An inductor of $$20~\text{mH}$$, a capacitor of $$100~\mu \text{F}$$, and a resistor of $$50~\Omega$$ are connected in series across a source of emf, $$V=10 \sin (314 t)$$. What is the power loss in this circuit?
1. $$0.79 ~\text{W}$$
2. $$0.43 ~\text{W}$$
3. $$2.74 ~\text{W}$$
4. $$1.13 ~\text{W}$$

Subtopic:  Power factor |
54%
From NCERT
NEET - 2018
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The potential differences across the resistance, capacitance and inductance are $$80$$ V, $$40$$ V and $$100$$ V respectively in an $$LCR$$ circuit. What is the power factor of this circuit?
1. $$0.4$$
2. $$0.5$$
3. $$0.8$$
4. $$1.0$$

Subtopic:  Power factor |
81%
From NCERT
NEET - 2016
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A 100 $\Omega$ resistance and a capacitor of 100 $\Omega$ reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

(1) 2.2 A

(2) 11A

(3) 4.4A

(4) 11$\sqrt{2}$A

Subtopic:  Different Types of AC Circuits |
56%
From NCERT
NEET - 2016
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A small-signal voltage V(t)=Vo sinωt is applied across an ideal capacitor C
(1) over a full cycle, the capacitor C does not consume any energy from the voltage source

(2) current I(t) is in phase with voltage V(t)

(3) current I(t) leads voltage V(t) by 180°

(4) current I(t) lags voltage V(t) by 90°

Subtopic:  Different Types of AC Circuits |
69%
From NCERT
NEET - 2016
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Which of the following combinations should be selected for better tuning of an $$LCR$$ circuit used for communication?
1. $$R=20~\Omega ,~L=1.5~\text{H},~C=35~\mu \text{F}$$
2. $$R=25~\Omega ,~L=2.5~\text{H},~C=45~\mu \text{F}$$
3. $$R=15~\Omega ,~L=3.5~\text{H},~C=30~\mu \text{F}$$
4. $$R=25~\Omega ,~L=1.5~\text{H},~C=45~\mu \text{F}$$

Subtopic:  Different Types of AC Circuits |
72%
From NCERT
NEET - 2016
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A small-signal voltage $$V(t)= V_0 \text{sin}(\omega t)$$ is applied across an ideal capacitor $$C$$: Find the correct statement from the options given below:
 1 over a full cycle, the capacitor $$C$$ does not consume any energy from the voltage source. 2 current $$I(t)$$ is in phase with voltage $$V(t)$$. 3 current $$I(t)$$ leads voltage $$V(t)$$ by $$180^{\circ}$$. 4 current $$I(t)$$, lags voltage $$V(t)$$ by $$90^{\circ}$$.
Subtopic:  Power factor |
74%
From NCERT
NEET - 2016
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An inductor $$20~\text{mH}$$, a capacitor $$50~\mu \text{F}$$, and a resistor $$40~\Omega$$ are connected in series across a source of emf $$V= 10\text{sin}340t$$. The power loss in the AC circuit is:
 1 $$0.67~\text{W}$$ 2 $$0.76~\text{W}$$ 3 $$0.89~\text{W}$$ 4 $$0.51~\text{W}$$
Subtopic:  Power factor |
From NCERT
NEET - 2016
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