A sheet is placed in a horizontal surface in front of a strong magnetic pole. A force is needed to
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Sheet will be attracted by the magnetic pole, hence a force is needed to hold the sheet.
The sheet will not experience any force, hence no external force is required to hold the sheet.
The sheet is conducting, hence eddy current will be produced in the sheet that will oppose the motion of the sheet. So, external for required to move the sheet with uniform velocity.
A non-conducting and non-polar sheet do not interact with magnetic field hence, no force is required in this case.
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