Force between two identical short bar magnets whose centre are r metre apart is 4.8N when their axes are in the same line .If the separation is increased to 2r metre the force between them is reduced to

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Force between two identical bar magnets whose centres are $r$ meters apart is $4.8 N,$ when their axis are in the same line. If the separation is increased to $2 r$ meters, the force between them is reduced to:

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