Question

A non-conducting sphere of radius 10 cm carries a charge of uniformly distributed throughout its volume. At 5 cm from the centre of the sphere, the electric field is 2000 N/C and its orientation points outwards. Find a) the volume charge density of the sphere; b) the modulus of the electric field at 20 cm from the centre.

Answer 1

a)

$\rho=7~\frac C{m^3},$

b)

$E=3.4~\frac{MN}C.$