A point charge of 3 mC is situated in air at the centre of a sphere of radius 10 cm. Find the T.N.E.I. through a portion of the surface of the sphere which subtends an angle of `pi//2` steradian at its centre.

If a charge q is placed at the centre of imaginary sphere of radius r then the N.E.I. at a point on such a sphere is

Charge of 12muC is given toa hollow metallic sphere of radius 0.1 m. find the potential at (i) the surface of the sphere (ii) the centre of the sphere.

The electric field intensity at a point at a distance of 1metre from the centre of a charged sphere of radius 25 cm is 10^4 N/C . Find the surface density of charge on the surface of the sphere. The sphere is situated in air .

Surface charge density of a sphere of a radius 10 cm is 8.85 xx 10^(-8)c//m^(2) . Potential at the centre of the sphere is

Surface charge density of a sphere of a radius 10 cm is 8.85 xx 10^(-8)c//m^(2) . Potential at the centre of the sphere is

A charge of 12 muC is kept inside a closed surface. What is the flux flowing through a portion of the surface, which subtends a solid angle of pi at the point where are charge is situated?

Find the angle subtended at the centre of a circle of radius 5cm by an arc of length (5 pi/3)cm.

The potential at the centre of a hollow charged sphere is 900 volts. Find the charge on the sphere in micro-coulomb if the sphere is of radius 10 cm.