An ac voltage $V=220 \sin \left(2 \times 10^3 t\right)$ Volt is applied to a series LCR circuit. Then the current amplitude in this circuit is:

(Given : $L=10 \mathrm{mH}, C=25 \mu \mathrm{~F}, R=100 \Omega$ )

An ac circuit contains a resistance of $1 \mathrm{k} \Omega$, a capacitor of $0.1 \mu \mathrm{~F}$ and an inductor of 1 mH connected in series. The resonance frequency of the circuit is approximately:

The peak value of an alternating current is 5 A and frequency is 60 Hz . How long will the current, starting from zero, take to reach the peak value?

To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inductor of reactance $45 \Omega$ are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively