Question

A magnet is in the form of a bar. Initially, the axis of the bar magnet is along the x-axis. At some distance from the magnet, a coil is kept in the y-z plane with its center along the x-axis. Which of the following motions of the bar magnet will NOT induce an electric current in the coil?

Answer 1

If the bar magnet is kept stationary then no current be induced in the coil.

Explanation:

• As the north pole is moved towards the coil, the magnetic field will increase in the direction of motion.  
• By Fleming's right-hand rule we can say that the current will be in an anti-clockwise direction.
• As the direction of the motion of the magnet is viewed from outside it shows that the current is only induced when the direction of motion of bar magnet changes.
• If it is kept stationary then no current will be induced.

Answer 2

Answer:

Correct option: (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.

no change in flux

Explanation: