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-

There is a hemisphere of radius R having a uniform volume charge density rho . Find the electric potential and field at the centre

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

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 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 circular metallic disc of radius R has a small circular cavity of radius r as shown in figure. On heating the system

A circular metallic disc of radius R has a small circular cavity of radius r as shown in figure. On heating the system

An infinitely long solid cylinder of radius R has a uniform volume charge density rho . It has a spherical cavity of radius R//2 with its centre on the axis of cylinder, as shown in the figure. The magnitude of the electric field at the point P , which is at a distance 2 R form the axis of the cylinder, is given by the expression ( 23 r R)/( 16 k e_0) . The value of k is . .

A cylinder of radius R_(1) have cylinderical cavity of radius R_(2) as shown in the figure and have current density J (down ward). Find Magnetic field when when point is in cavity