A non-conducting sphere of radius R has a spherical cavity of radius `R//2` as shown. The solid part of the sphere has a uniform volume charge density `rho`. Find the magnitude and direction of electric field at point (a) O and (b) A.

A conducting sphere of radius r has a charge . Then .

In a long insulating cylinder of radius R a cylindrical tunnel of radius a located at a distance b from the axis of the cylinder as shown in the figure. R R b - The solid part of the cylinder has a uniform volume charge density P. Find the magnitude and direction of the electric field inside the tunnel.

An infinity long cylinder of radius R has an infinitely long cylindrical cavity of radius (R)/(2) are shown in the figure. The remaining portion has uniform volume charge density rho . The magnitude of electrical field at the centre of the cavity is-

An infinity long cylinder of radius R has an infinitely long cylindrical cavity of radius (R)/(2) are shown in the figure. The remaining portion has uniform volume charge density rho . The magnitude of electrical field at the centre of the cavity is-

A solid sphere of radius 'R' has a cavity of radius (R)/(2) . The solid part has a uniform charge density 'rho' and cavity has no charge. Find the electric potential at point 'A'. Also find the electric field (only magnetude) at point 'C' inside the cavity

A solid sphere of radius R has a spherical cavity of radius r as shown in the figure. If the volume charge density sigma is uniformly distributed over the whole volume of the sphere, then electric field strength at the centre of the sphere will be

A solid sphere of radius R has a spherical cavity of radius r as shown in the figure. If the volume charge density sigma is uniformly distributed over the whole volume of the sphere, then electric field strength at the centre of the sphere will be

A sphere of charge of radius R has uniform volume charge density. The electric field due to the sphere of charge at a point