For an $AC$ circuit containing capacitor only, the applied $AC$ voltage waveform is shown in figure.

In the given figure, which voltmeter will read zero voltage at resonant frequency?

In the circuit shown in figure, the $AC$ source gives a voltage $V=20\cos \left(2000t\right)$. Neglecting source resistance, the voltmeter and ammeter readings will be (approximately)

A signal generator supplies a sine wave of $20 \mathrm{V},5 \mathrm{kHz}$ to the circuit shown in the figure. Then, choose the wrong statement.

An $AC$ voltage $V=V_0\sin 100 t$ is applied to the circuit, the phase difference between current and voltage is found to be $\frac{\mathrm{\pi }}{4},$ then

When an alternating voltage of $220 \mathrm{V}$ is applied across a device $P$, a current of $0.25 \mathrm{A}$ Flows through the circuit, and it leads the applied voltage by an angle $\frac{\mathrm{\pi }}{2} \mathrm{radian}$ . When the same voltage source is connected across another device $Q$, the same current is observed in the circuit but in phase with the applied voltage. What is the current when the same source is connected across a series combination of $P$ and $Q$.

An inductor $\left(X_{\mathrm{L}}=2 \mathrm{\Omega }\right)$ a capacitor $\left(X_{\mathrm{C}}=8 \mathrm{\Omega }\right)$ and a resistance $\left(R=8 \mathrm{\Omega }\right)$ are connected in series with an $AC$ source. The voltage output of $AC$ source is given by $V=10\cos \left(100\pi t\right)$

The instantaneous potential difference between points $A$ and $B$, when the applied voltage is $\frac{3^{th}}{5}$ of the maximum value of applied voltage is