Question

A spherical conductor of radius 12cm has a charge of 1.6 × 10^-7 C distributed uniformly on its surface. What is the electric field

1. Inside the sphere.

2. Just outside the sphere.

3. At point 18cm from the centre of the sphere?

Answer 1

1. Zero

2. \(\frac{1}{4\pi\varepsilon_0}\frac{q}{r^2}\)= 9x10⁹x \(\frac{1.6\times10^{-7}}{(12\times10^{-2})^2}\)

= \(\frac{14.4\times10^{-2}}{144\times10^{-4}}\) = 10⁵NC^-1