Q. 4

A metal sheet is placed in front of a strong magnetic pole. A force is needed to
A. hold the sheet there if the metal is magnetic

B. hold the sheet there if the metal is non-magnetic

C. move the sheet away from the pole with uniform velocity if the metal is magnetic.

D. move the sheet away from the pole with uniform velocity if the metal is non-magnetic.

Neglect any effect of paramagnetism, diamagnetism and gravity.

Answer :

A metal sheet is placed in front of the strong magnetic pole. This pole has q strong magnetic field. A strong magnetic pole will attract the magnet if the metal is magnetic then a force is needed to hold the metal sheet. If the metal is magnetic or not if we want to move the metal sheet away from that strong magnetic pole we need some force do it. Because of the movement, eddy currents will be induced in the sheet. These eddy currents produce thermal energy. Thermal energy comes at the cost of kinetic energy. Thus, the plates slow down. So we need a force to hold the sheet if the metal is magnetic. And also the sheet needs a force to move away from that strong magnetic filed even it is nonmagnetic.

So option A, C and D are correct.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Electromagnetic InductionElectromagnetic InductionElectromagnetic Induction50 mins
Source of Electromagnetic waveSource of Electromagnetic waveSource of Electromagnetic wave6 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :