Which of the following curves correctly represents the variation of capacitive reactance $X_C$ with frequency $f$?

The reactance of a capacitor of capacitance $C \mu F$ for an $ac$ frequency of $\frac{400}{\pi} \ Hz$ is $25 \ \Omega$. The value of $C$ is ..... $\mu F$.

Explain why the reactance provided by a capacitor to an alternating current decreases with increasing frequency.

In a circuit containing an inductance of zero resistance,the $e.m.f.$ of the applied $ac$ voltage leads the current by ......$^o$

An $a.c.$ of frequency $f$ is flowing in a circuit containing only an ideal choke coil of inductance $L$. If $V_0$ and $i_0$ represent peak values of the voltage and the current respectively,the average power given by the source to the choke coil is equal to

In a purely resistive $ac$ circuit,the current