Alternating Current

Figure shows a circuit contains three identical resistors with resistance $R=9.0\Omega\,$ each, two identical inductors with inductance $L=2.0\mathrm{mH}$ each, and an ideal battery with emf $\epsilon\,=18V$. The…

A part of a complete circuit is shown in the figure. At some instant, the value of current I is$1A$ and it is decreasing at a rate of$10^{2}\mathrm{As}^{-1}$. The value of the potential difference$V_{p}-V_{Q},$ (in…

A $10\Omega\,$ resistance is connected across$220V-50\mathrm{Hz}$AC supply. The time taken by the current to change from its maximum value to the $\mathrm{rms}$ value is:

An inductor $(L=0.03\text{H})$ and a resistor $(R=0.15\text{k\Omega})$ are connected in series to a battery of $15\text{V}$ E.M.F. in a circuit shown below. The key $K_{1}$ has been kept closed for a long time. Then at…

Match List-I with List-II List-i List-II a Phase difference between current and voltage in a purely resistiveACcircuit i $\frac{\pi\,}{2};$ current leads voltage b Phase difference between current and voltage in a pure…

The figureshows a circuit that contains four identical resistors with resistance $R=2.0\Omega\,,$two identical inductors with inductance $L=2.0\mathrm{mH}$ and an ideal battery with E.M.F.$E=9V.$The current $i$ just…

In an$\text{A.C.}$ circuit, the instantaneous e.m.f. and current are given by,$E=100\sin\,30t$$,I=20\sin\,\left(30t-\frac{\pi\,}{4}\right)$. In one cycle of $\text{A.C.}$, the average power consumed by the circuit (in…

For the given figures, choose the correct options:

For a series $LCR$circuit, $I$ vs $\omega\,$curve is shown (a)To the left of$\omega\,_{r}$, the circuit is mainly capacitive. (b)To the left of$\omega\,_{r}$, the circuit is mainly inductive. (c)At$\omega\,_{r}$,…

At very high frequencies, the effective impedance of the given circuit will be _________$\Omega\,.$

In the circuit shown in the figure, the ratio of the quality factor and the band width is _____ $s$.

An AC source is connected to an inductance of $100\mathrm{mH}$, a capacitance of $100\mu\,F$ and a resistance of $120\Omega\,$ as shown in figure. The time in which the resistance having a thermal capacity…