Exercise (Analytical Questions)

Alternating voltage is generated by rotating a coil in a normal magnetic field with 50 Hz frequency. If V_rms = 220V, then the maximum flux passing through the coil is :- 

A RC series circuit of R = 15$\Omega$ and C = 10 µF is connected to 20 volt DC supply for very long time. Then capacitor is disconnected from circuit and connected to inductor of 10 mH. Find amplitude of current. 

In series LCR circuit L = 10 mH, C = 10µF. R = 20$\Omega$ is connected to AC source of V = 200sin$\omega$t. Find power at half power frequencies. 

A coil has resistance of $10 \mathrm{\Omega }$ and an inductance of $0.4 \mathrm{H}$. It is connected to an AC source of $6.5 \mathrm{V}\text{,} \frac{30}{\mathrm{\pi }} \mathrm{Hz}$. The average power consumed in the circuit is,

An alternating emf of angular frequency $\omega$ is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency:-

The inductance of the oscillatory circuit of a radio station is 10 milli henry and its capacitance is 0.25µF. Taking the effect of the resistance negligible, wavelength of the broadcasted waves will be (velocity of light = 3.0 × 10⁸ m/s, $\pi$ = 3.14) : 

A coil has an inductance of$0.7 \mathrm{H}$ and is joined in series with a resistance of $220 \mathrm{\Omega }$. When the alternating emf of $220 \mathrm{V}$ at $50 \mathrm{Hz}$ is applied to it then the phase through which current lags behind the applied emf and the wattles component of current in the circuit will be respectively : 

In the circuit shown in the figure, the A.C. source gives a voltage $V = 20 \cos (2000 t) \mathrm{V}$ neglecting source resistance, the voltmeter and ammeter readings will be :