question_answer 4)

A spherical conductor of radius 12 cm has a charge of 1.6 x 10–7 C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre the sphere?  

Answer:

                (a) Inside a conductor, the electric field is zero because the charge resides on the surface of a conductor.                 (b) Electric field just outside the sphere is given by                                                                 (c) Electric field at a distant point given by                                                 = 4.44 x 104 N C?1.