A magnet is in the form of a bar. Initially, the axis of the bar magnet is along X-axis. At some distance from the magnet, a coil is kept in the Y to Z plane with its centre along X-axis. Which of the following motions of the bar magnet will NOT induce electric current in the coil?
(a) Translational vibrations perpendicular to X-axis.
(b) The bar magnet axis is turned to make an acute angle with the X-axis and the magnet is rotated about X-axis with the south pole fixed on x-axis.
(c) The bar magnet axis is swinging back and forth about the X-axis with the south pole fixed on the X-axis.
(d) The bar magnet spins about a perpendicular bisector as its axis of rotation, with its center on the X-axis.