Q. 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 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:
A) A, C and D only
B) C only
C) B and D only
D) A and C only
Explanation
[Solution by Claude - not from source] A magnetic sheet is attracted (A true). A conducting sheet moved in the field has eddy-current drag (C true). A non-magnetic or non-conducting, non-polar sheet feels no force (B and D false). Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.