A charged oil drop is suspended in a uniform electric field `27.5 xx 10^(4)V//m`, so that it neither rises nor falls. Find the charge on the drop. [Take, mass of the drop is `9 xx 10^(-15)kg`] (Neglect air resistance).

A current carrying conductor of length 1 m is placed in a uniform magnetic field of 5 xx 10^-4 Wb/ m^2 at an angle of 60^@ with the field. If the magnetic force on the conductor is 3 xx 10^-3 N , calculate the current in the conductor.

A charge of 5.31 xx 10^(-7)C is placed at the centre of an imaginary cube. Find the electric flux through one of its faces.