Jharkhand Board-2018

A $60 \mathrm{\mu F}$ capacitor is connected to a $110 \mathrm{V}$, $60 \mathrm{Hz}$ a.c. supply. Determine the root-mean-square value of the current in the circuit.

Define reactance and impedance in A.C. circuits. Derive expression for instantaneous current in a series L-C-R circuit if connected to an alternating emf.

The phase difference between current and voltage in an ac circuit containing resistance only is

Derive an expression for average or mean value of alternating current for half cycle.

What is a transformer? Describe the principle, construction and working method of a transformer.

In a series $LCR$ circuit $L=8 \mathrm{H}$, $C=0.5 \mathrm{\mu F}$ and $R=100 \mathrm{\Omega }$. The resonant frequency of the circuit is

The phase difference between current and voltage in an A.C. circuit containing inductance only is.