. An oil drop of mass m carrying charge Q is to be held stationary in the gravitational field of the earth. What is the magnitude and direction of the electrostatic field required for this purpose? A point charge Q is kept at the intersection of (i) face diagonals (ii) diagonals of a cube of side. L. What is the electric flux linked with the cube in (i) and (ii)? The electric field in a certain space is given by . Calculate the flux crossing the surface of area
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