A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to A

Question

A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to A. hold the sheet there if it is magnetic. B. hold the sheet there if it is non-magnetic. C. move the sheet away from the pole with uniform velocity if it is conducting. D. move the sheet away from the pole with uniform velocity if it is both, non-conducting and nonpolar. Choose the correct statement(s) from the options given below.

Professor PC Thomas Classes · Answer

(b) : The strong magnetic pole will attract the magnet, so force is needed to hold the sheet if it is conducting. If the sheet is conducting and moved away from the pole, magnetic flux changes due to which eddy currents are induced. So, the force is needed to move the sheet away from the pole with uniform velocity.