Figure given shows four arrangement of charged particles, all at the same distance from the origin. Rank the situations according to the net electric potentials (V₁, V₂, V₃, V₄) at the origin, most positive first :-

Two charges $q_1$ and $q_2$ are placed $30\mathrm{cm}$ apart, as shown in the figure. A third charge $q$ is moved along the arc of a circle of radius $40\mathrm{cm}$ from $C$ to $D$. The change in the potential energy of the system is $\frac{{\mathrm{q}}_3}{4{\mathrm{\pi \epsilon }}_0}k$, where $k$ is:

Four points $a,b,c$ and $d$ are set at equal distance from the centre of a dipole as shown in the figure. The electrostatic potentials $V_a,V_b,V_c$ and $V_d$ would satisfy the following relation:

Figure shows a family of parallel equipotential surfaces and four paths along which an electron is made to move from one surface to another as shown.

(A) What is the direction of the electric field?

(B) Rank the paths according to work done, greatest first.

[Assume $a=1 m, b=10 m, Q={10}^{-3} C$]