A non-conducting semi circular disc (as shown in figure) has a uniform surface charge density `sigma`. The ratio of electric field to electric potential at the centre of the disc will be

The electric field near a conducting surface having a uniform surface charge denstiy sigma is given by

The electric field near a conducting surface having a uniform surface charge denstiy sigma is given by

The diagram shows a part of disc of radius R carrying uniformly distributed charge of density sigma . Electric potential at the centre O of parent disc is

A dielectric circular disc of radius R carries a uniform surface charge density sigma . If it rotates about its exis with angular velocity omega , the magnetic field at the cente of disc is :

Three large plates having uniform surface charge densities are shown in figure. Electric field at point 'P' will be :

The quarter disc of radius R (see figure) has a uniform surface charge density sigma . (a) Find electric potential at a point (O,O,Z) (b). Find the Z component of electrif field at (O,O,Z)

The quarter disc of radius R (see figure) has a uniform surface charge density sigma . (a) Find electric potential at a point (O,O,Z) (b). Find the Z component of electrif field at (O,O,Z)

If the uniform surface charge density on the infinite plane sheet is sigma , electric field near the surface will be

Find the electric field on the axis of a charged disc.