Asolid conducting sphere with radius r = 0.390 m carries a net charge of +0.650 nc.
electric field: find the electric field: at a point 0.100 m outside the surface of the sphere.

38.5 N/C

Explanation:

The electric field generated by a charged sphere at a point outside the sphere is equivalent to the electric field generated by a single point charge, and it is given by

where

is the Coulomb's constant

Q is the net charge

r is the distance from the centre of the sphere

In this problem, we have

Substituting into the equation, we find