A parallel plate capacitor of capacitance $C$ is charged to a potential $V$ by a battery. Without disconnecting the battery, the distance between the plates is tripled and a dielectric medium of $k=10$ is introduced between the plates of the capacitor. Explain giving reasons, how will the following be affected charge on the capacitor.

The electric field inside a parallel plate capacitor is $E$. Find the amount of work done in moving a charge $q$ over a closed rectangular loop $a b c d a$.

Figure below shows the variation of electrostatic potential $V$ with distance $\text{'}x\text{'}$ for a given charge distribution. From the points marked $A, B$ and $C$, identically the point at which the electric field is zero. Explain your answer.

Figure below shows the variation of electrostatic potential $V$ with distance $\text{'}x\text{'}$ for a given charge distribution. From the points marked $A, B$ and $C$, identically the point at which the electric field is maximum. Explain your answer.

Two identical plane metallic surfaces $A$ and $B$ are kept parallel to each other in air, separated by a distance of $1 \mathrm{cm}$, as shown in figure below.

Surface $A$ is given a positive potential of $10 V$, and the outer surface of $B$ is earthed.

What is the magnitude and direction of the uniform electric field between points $Y$ and $Z$?

Two identical plane metallic surfaces $A$ and $B$ are kept parallel to each other in air, separated by a distance of $1 \mathrm{cm}$, as shown in figure below.

Surface $A$ is given a positive potential of $10 V$, and the outer surface of $B$ is earthed.

What is the work done in moving a charge of $20 \mu C$ from point $X$ to point $Y$.

The electric potential as a function of distance $x$ is shown in Figure below. Construct a graph of the electric field strength $E$.

The two graphs drawn here, show the variation of electrostatic potential $\left(V\right)$ with $\frac{1}{r}$($r$ being distance of the field point charge) for two point charges $q_1$ and $q_2$. What are the signs of the two charges?