Question
Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure.
The force on the charge Q is
-
zero
-
directed along OP
-
directed along PO
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directed perpendicular to the plane of paper
Solution
A.
zero
The force of attraction on Q by the north pole of the first magnet is F. The force of attraction on the same charge by n the north pole of another magnet must be opposite to that of the first magent. Thus, they concel the effect of one other and hence force on the charge Q is zero.
