Question -
Answer -
(a) Radius of the spherical conductor, r =12 cm = 0.12 m
Charge is uniformly distributed over theconductor, q = 1.6 × 10−7 C
Electric field inside a spherical conductor is zero. Thisis because if there is field inside the conductor, then charges will move toneutralize it.
(b) Electric field E just outside theconductor is given by the relation,
Where,
= Permittivity of freespace
Therefore, the electricfield just outside the sphere is 
(c) Electric field at a point 18 m from the centre of thesphere = E1
Distance of the point from thecentre, d = 18 cm = 0.18 m
Therefore, the electric field at a point 18 cm from thecentre of the sphere is
