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Question

A rectangle has sides of lengths 6cm and 8cm. Two magnetic poles each of pole strength 'm' are placed at the ends of one side of smaller length and magnetic force acting between them is 'F'. If they are moved to new positions of same rectangle so that they are diagonally opposite. Find the final force acting on each pole.

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Solution

Force F action each magnet is F=Km1m282×104 ..(1) where K is constant
When magnets are diagonally opposite then final force F
F=Km1m2102×104 ..(2)
From (1) and (2),
F=82102F=64100F

F=1625F

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