A wire carrying a current i from O to A is placed inside a uniform magnetic field vector B = -B0k. The shape of the wire is parabolic and has equation and has equation Y = 2x - x2. The force on the wire will be
(a) F = 2B0 i, upwards
(b) F = 2B0 i, downwards
(c) F = 4B0 i, upwards
(d) F = 4B0 i, downwards
