The magnitude of electric field at a distance r from a point charge Q is same at all points on the surface of a sphere of radius r as shown in figure.
ii. Magnitude of electric field is given by,
E = \(\frac{1}{4\pi \epsilon_0}\,\frac{Q}{r^2}\)
iii. Its direction is along the radius of the sphere, pointing away from its centre if the charge is positive.
