List of top Physics Questions on LCR Circuit

A logic circuit provides the output y as per the following truth table:

A	B	Y
0	0	1
0	1	0
1	0	1
1	1	0

The expression for the output Y is:

Given below are two statements:
Statement I: In an LCR series circuit, current is maximum at resonance. 
Statement II: Current in a purely resistive circuit can never be less than that in a series LCR circuit when connected to the same voltage source. 
In the light of the above statements, choose the correct from the options given below.

For a given series LCR circuit, it is found that maximum current is drawn when value of variable capacitance is $2.5 \, \text{nF}$. If resistance of $2000 \, \Omega$ and $100 \, \text{mH}$ inductor is being used in the given circuit. The frequency of AC source is ____ $\times \, 10^3 \, \text{Hz}$. (Given $\pi^2 = 10$)

A series LCR circuit is subjected to an AC signal of 200 V, 50 Hz. If the voltage across the inductor (L = 10 mH) is 31.4 V, then the current in this circuit is ________ :

A LCR circuit is at resonance for a capacitor C, inductance L and resistance R. Now the value of resistance is halved keeping all other parameters same. The current amplitude at resonance will be now:

An ac source is connected in given series LCR circuit. The rms potential difference across the capacitor of 20 μF is .............. V.

The figure shows variation of $R$, $X_L$, and $X_C$ with frequency $f$ in a series LCR circuit. Then for what frequency point is the circuit capacitive?

Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?

In an LCR series circuit, the value of only capacitance $C$ is varied. The resulting variation of resonance frequency $f_0$ as a function of $C$ can be represented as

The amplitude of the charge oscillating in a circuit decreases exponentially as $Q = Q_0 e^{-Rt/2L}$, where $Q_0$ is the charge at $t=0s$. The time at which charge amplitude decreases to 0.50 $Q_0$ is nearly:
[Given that $R = 15 \Omega$, $L = 12 mH$, $ln(2) = 0.693$]

An AC voltage $V = 20 \sin 200 \pi t$ is applied to a series LCR circuit which drives a current $I = 10 \sin \left( 200 \pi t + \frac{\pi}{3} \right)$. The average power dissipated is:

In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance frequency unchanged, the new inductance should be :

Output of given circuit represents which logic gate :

Total impedance of a series LCR circuit varies with angular frequency of the AC source connected to it as shown in the graph. The quality factor Q of the series LCR circuit is

In series LCR circuit at resonance, the phase difference between voltage and current is

Water falls from a $40$ m high dam at the rate of $9 \times 10^4$ kg per hour. Fifty percent of gravitational potential energy can be converted into electrical energy. The number of $100W$ lamps that can be lit is:

The pressure inside a tyre is 4 times that of the atmosphere. If the tyre bursts suddenly at temperature $300K$, what will be the new temperature?