Which of the following curves correctly represents the variation of capacitive reactance $\left(X_c\right)$ with frequency $n$

If the input voltage $V_{\mathrm{i}}$ to the circuit below is given by $V_{\mathrm{i}}\left(t\right)=A\cos \left(2\pi ft\right)\text{,}$ the output voltage is given by $V_{\mathrm{o}}\left(t\right)=B\cos \left(2\pi ft+\varphi \right)$.

Which one of the following four graphs best depict the variation of $\varphi$ vs $f$?

An AC voltmeter connected between points $A$ and $B$ in the circuit below reads $36 \mathrm{V}.$ If it is connected between $A$ and $C,$ the reading is $39 \mathrm{V}.$ The reading when it is connected between $B$ and $D$ is $25 \mathrm{V}$. What will the voltmeter read when it is connected between $A$ and $D?$ ( Assume that the voltmeter reads true RMS voltage values and that the source generated a pure AC.)

In a circuit consisting of a capacitance and a generator with alternating emf, $E_g=E_{go}sin\omega t, V_C$ and $I_{\mathit{C}}$ are the voltage and current. Correct phasor diagram for such circuit is

A parallel combination of pure inductor and capacitor is connected across a source of alternating EMF $e$. The currents flowing through an inductor and capacitor are $i_L$ and $i_C$ respectively. In this parallel resonant circuit, the condition for currents $i$ $,i_L$ and $i_C$ is ($i=$net RMS current in the circuit)