
A uniformly charged solid sphere of radius has potential (measured with respect to ) on its surface. For this sphere the equipotential surfaces with potentials have radius and , respectively. Then


Important Questions on Electrostatics
The region between two concentric spheres of radii and , respectively (see figure), has volume charge density , where is a constant and is the distance from the centre. At the centre of the spheres is a point charge . The value of such that the electric field in the region between the spheres will be constant, is



(i) Three equal charges each are placed at three corners of an equilateral triangle of side. Find out force acting on one of the charge due to other two charges?
(ii) In the above question, if one of the charge is replaced by negative charge then find out force acting on it due to other charges?
(iii) Repeat the part (i) if magnitude of each charge is doubled and side of triangle is reduced to half.

A solid sphere of radius is uniformly charged with charge density in its volume. A spherical cavity of radius is made in the sphere as shown in the figure. Find the electric potential at the centre of the sphere.

A uniform surface charge of density is given to a quarter of a disc extending up to infinity in the first quadrant of plane. The centre of the disc is at the origin . Find the component of the electric field at the point and the potential difference between the points


