Figure below shows lines of constant potential in a region in which electric field exists. The values of the potential are indicated. Out of the points $A, B$ and $C$, which will be of greatest electric field strength? Give reason.

The equipotential surfaces of certain field are shown in figure below. It is given that $V_1>V_2$. Draw the corresponding lines of force for this pattern. Also state the region in which the electric field intensity is highest.

A test charge $\text{'}q\text{'}$ is moved without acceleration from $A$ to $C$ along the path from $A$ to $B$ and then from $B$ to $C$ in electric field $E$ as shown in the figure below. Calculate the potential difference between $A$ and $C$.

A test charge $\text{'}q\text{'}$ is moved without acceleration from $A$ to $C$ along the path from $A$ to $B$ and then from $B$ to $C$ in electric field $E$ as shown in the figure below. At which point (of the two) is the electric potential more and why?

Find the P.E. associated with a charge$\text{'}q\text{'}$ if it were present at the point $P$ with respect to the 'set-up' of two charged spheres, arranged as shown in figure below. Here $O$ is the mid-point of the line $O_1{O}_2$.

A sheet of aluminium foil of negligible thickness is placed between the plates of a capacitor, as shown in figure below. What effect has it on the capacitance if the foil is electrically insulated.

A sheet of aluminium foil of negligible thickness is placed between the plates of a capacitor, as shown in figure below. What effect has it on the capacitance if the foil is connected to the upper plate with a conducting wire?