# (a) Draw equipotential surfaces corresponding to the electric field that uniformly increases in magnitude along with the z-directions.(b) Two charges – q and + q are located at points and . What is the electrostatic potential at the points     and ?

(a)

The equipotential surfaces will be parallel to x-y plane.

(b) Electric potential at

Now, Electric potential at  due to

Where,   and

and, Electric potential at  due to   charge.

Where,   and

Therefore, the net potential,

At  and as  plane is denoted by

The distance for and  will be the same at XY plane.

Therefore, the XY plane is an equipotential surface. Therefore the potential due to charges = 0

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