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A U-magnet of pole strength 100 Am has i...

A U-magnet of pole strength 100 Am has its poles separated by `5 xx 10^-2 m`. At mid point of line joining the poles the force on unit north pole is :

A

`3.2 xx 10^-2 N`

B

`3.2 xx 10^-3 N`

C

3.2 N

D

`3.2 xx 10^-4 N`.

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