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Two identical short bar magnets of magne...

Two identical short bar magnets of magnetic moment M each are placed at distance r apart in end-on position, then magnetic force between both is

A

`(mu_0/(4pi)).(M^2/r^2)`

B

`(mu_0/(4pi)).(4M^2/r^4)`

C

`(mu_0/(4pi)).(6M^2/r^4)`

D

`(mu_0/(4pi)).(6M^2/r^2)`

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