Q. Magnetic induction at a point on the axial line of a short bar magnet is B towards east. If the magnet is turned through 90° in clock wise direction, then magnetic induction at the same point is (Neglect earth’s magnetic field)
(a) B/4 towards east
(b) B/2 towards west
(c) B/2 towards north
(d) B/2 towards south
Sol: If the magnet is turned through 90° in clock wise direction , the same point lies on equitorial line & the magnetic induction becomes half i.e. B/2 .