A transformer having an efficiency of $75\%$ is working on $220~\mathrm{V}$ and $4.4~\mathrm{kW}$ power supply. If the current in the secondary coil is $5~\mathrm{A}$. What will be the voltage across the secondary coil and the current in the primary coil?
1. $V_s=220 \mathrm{~V}, I_p=20 \mathrm{~A}$
2. $V_s=660 \mathrm{~V}, I_p=15 \mathrm{~A}$
3. $V_s=660 \mathrm{~V}, I_p=20 \mathrm{~A}$
4. $V_s=220 \mathrm{~V}, I_p=15 \mathrm{~A}$
 

One mole of a monoatomic ideal gas undergoes the process $A\rightarrow B$ in the given $P-V$ diagram. The molar heat capacity for this process is:

1. $\frac{3R}{2}$
2. $\frac{13R}{6}$
3. $\frac{5R}{2}$
4. $2R$

A cylinder of radius $R$ and length $L$ is placed in a uniform electric field $E$ parallel to the cylinder axis. The total flux for the surface of the cylinder is given by:
1. $2\pi R^2E$
2. $\frac{\pi R^2}{E}$
3. $\frac RE$
4. zero

If A + B = C and that C is perpendicular to A. What is the angle between A and B, if |A| = |C|?
1. $\frac{\pi}{4}~\text{rad}$
2. $\frac{\pi}{2}~\text{rad}$
3. $\frac{3\pi}{4}~\text{rad}$
4. $\pi~\text{rad}$

In the given figure, potential difference between $A$ and $B$ is:

1. 0
2. $5~\mathrm{V}$
3. $10~\mathrm{V}$
4. $15~\mathrm{V}$