There is a uniform electrostatic field in a region. The potential at various points on a small sphere centred at P, in the region, is found to vary between the limits $589.0 V$ to $589.8 V$. What is the potential at a point on the sphere whose radius vector makes an angle of $60^0$ with the direction of the field ?

Question

$\begin{array}{1 1}(1)\; 589.5 V\\ (2)\; 589.2 V\\ (3)\; 589.4 V\\ (4)\; 589.6 V \end{array}$