A spherical conductor of radius 10 cm has a charge of \(3.2 × 10^{−7} C\) distributed uniformly. What is the magnitude of electric field at a point 15cm from the centre of the sphere? \(\displaystyle \frac{1}{ 4\, \pi\, \epsilon_0} = 9 × 10^9 N m^2/C^2\))