A metal ring is inserted through the soft iron cylinder which is wounded with copper wire.
A metal ring is inserted through the soft iron cylinder which is wounded with copper wire. When DC is supplied between the ends of the coil, then …………………….
A) the metal ring is levitated on the coil and stays there.
B) the metal ring is levitated and falls down immediately.
C) the metal ring rotate round the cylinder at the same position.
D) none
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