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

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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.
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