Embibe Experts Solutions for Chapter: Alternating Current, Exercise 1: Exercise#1

A resistor $R$, an inductor $L$ and a capacitor $C$ are connected in series to an oscillator of frequency $\nu$. If the resonant frequency is ${\nu }_{\mathrm{r}}$, then the current lags behind voltage, when

A resistor $R$, an inductor $L$, a capacitor $C$ and voltmeters $V_1, V_2$ and $V_3$ are connected to an oscillator in the circuit as shown in the adjoining diagram. When the frequency of the oscillator is increased upto resonance frequency, the voltmeter reading (at resonance frequency) is zero in the case of,

A capacitor is perfect insulator for

A choke coil should have,

A choke coil is preferred to a rheostat in AC circuit as,

With increase in frequency of an AC supply, the inductive reactance,

With increase in frequency of an AC supply, the capacitive reactance,

An AC ammeter is used to measure current in a circuit. When a given direct constant current passes through the circuit, the AC ammeter reads $3 \mathrm{A}$. When an alternating current passes through the circuit, the AC ammeter reads $4 \mathrm{A}$. Then the reading of this ammeter if DC and AC flow through the circuit simultaneously is,