A pitch ball covered with a tin roll having a mass m kg hangs by a fine silk thread of length l metres in an electric field E. When the ball is given the charge of q coulomb, it stands out d metres apart from the vertical line.The magnitude of electric field will be
A pitch ball covered with a tin roll having a mass m kg hangs by a fine silk thread of length l metres in an electric field E. When the ball is given the charge of q coulomb, it stands out d metres apart from the vertical line.The magnitude of electric field will be