Question

Two similar charges of 250 statC are situated on small sphere 15 cm apart. What is the electric field intensity midway between the spheres? What is the potential at this point?

Answer 1

$E=\frac{kq}{r^2}-\frac{kq}{r^2}=0,$

$\varphi=\frac{kq}{r}+\frac{kq}{r}=\frac{2kq}{r}= 30~V.$