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 non-polar. 

Choose the correct statement(s) from the options given below: 

(1) B and D only 

(2) A and C only 

(3) A, C and D only 

(4) C only

Answer 1

Correct option is : (2) A and C only 

A. A magnetic pole will repel or attract magnetic sheet so force is need. 

B. If sheet is non-magnetic, no force needed. 

C. If it is conducting, then there will be addy current in sheet, which opposes the motion. So forces is needed move sheet with uniform speed. 

D. The non-conducting and non-polar sheet do not interact with magnetic field of magnet.