## Question

### Solution

Correct option is

0.704 A, 0.744 W

The resonant frequency is  .

The frequency 10% lower than this is .

At this frequency, we have And  impedance,  Now, the current amplitude is Average power dissipated is Here  .

#### SIMILAR QUESTIONS

Q1 capacitor, a 0.3-H inductor and a resistor are connected in series with a 120-60Hz a.c. source. Calculate the impedance of the circuit.

Q2

A circuit containing a 80-mH inductor and a 60- capacitor in series is connected to a 230 V-50 Hz supply. The resistance in the circuit is negligible. Obtain the current amplitude and rms current.

Q3

A series L-C-R circuit having L = 1.5 H, is connected to a 200-V a.c. supply of variable frequency. When the supply frequency equals the natural frequency of the circuit, find the average power transferred to the circuit in one full cycle.

Q4

An inductor L, a capacitor of and the resistor of are connected in series with an a.c. source of frequency 50 Hz. If the current is in phase with the voltage, calculate the inductance of the inductor.

Q5

A capacitor, a resistor and a 80-mH inductor are in series with a 50-Hz a.c source. Calculate the capacitance if the current is in phase with the voltage.

Q6

A series L-C circuit has L = 0.405 H and . The resistance R is zero. Find the frequency of resonance.

Q7

In a series L-C-R circuit connected to a variable frequency 220-V source; we have : L = 4.0 H, . Calculate the resonant frequency of the circuit.

Q8

A variable-frequency 230-V alternating voltage source is connected across a series combination of L = 5.0 H, and . Calculate the angular frequency of the source which drives the circuit in resonance.

Q9

A series LCR circuit with L = 0.12 H, C = 480 nF and is connected to a 230-V variable-frequency supply. What is the source frequency for which current a amplitude is maximum? Find this maximum value.

Q10

A 750-Hz, 20-V source is connected to a resistance of , an inductance of 0.1803 H and a capacitance of , all in series. Calculate the time in which the resistance (thermal capacity = 2 JoC–1) will get heated by 10oC.