Question

Two tiny spheres carrying charges 1.5 μC and 2.5 μC are located 30 cm apart. Find the potential and electric field:

 (a) at the mid-point of the line joining the two charges, and 

(b) at a point 10 cm from this midpoint in a plane normal to the line and passing through the mid-point.

Answer 1

Two charges placed at points A and B are represented in the given figure. O is the midpoint of the line joining the two charges.

Therefore, the potential at a point 10 cm (perpendicular to the mid-point) is 2.0 × 10⁵ V and electric field is 6.6 ×10⁵ V m^−1.