The amount of work done by electric field in joules in carrying a charge $+q$ along the closed path PQRSP between the oppositely charged metal plates is  (where, $E$ is electric field between the plates) 

Figure shows a closed surface which intersects a conducting sphere. If a positive charge is placed at the point P, the flux of the electric field through the closed surface: 

An ellipsoidal cavity is carved within a perfect conductor. A positive charge $q$ is placed at the centre of the cavity. The points $A \text{and} B$ are on the cavity surface as shown in the figure. 

The figure shows the current $I$ in a single-loop circuit with a battery $B$ and resistance $R$ (and wires of negligible resistance). Then find the order of following at the point $a\mathit{,}\mathit{ }b$ and $c$.

(a) The magnitude of the current,

(b) The electric potential, and

(c) The electric potential energy of the charge carriers (electron), the greatest first.

The magnitude of electric force on $2 \mathrm{\mu C}$ charge placed at the centre $O$ of two equilateral triangles each of side $10 \mathrm{cm}$, as shown in the figure is $P$. If charge $A\mathit{,}\mathit{ }B\mathit{,}\mathit{ }C\mathit{,}\mathit{ }D\mathit{,}\mathit{ }E$ and $F$ are $2 \mathrm{\mu C}, 2 \mathrm{\mu C}, 2 \mathrm{\mu C}, -2 \mathrm{\mu C}, – 2 \mathrm{\mu C}, – 2 \mathrm{\mu C}$ respectively, then $P$ is:

Two-point charges of the same magnitude and opposite sign are fixed at points $A$ and $B$. A third small point charge is to be balanced at point $P$ by the electrostatic force due to these two charges. The point $P$