The pole strength of a bar magnet is 48 ...

The pole strength of a bar magnet is 48 ampere-metre and the distance between its poles is `25cm`. The moment of the couple by which it can be placed at an angle of `30^(@)` with the uniform magnetic intensity of flux density `0.15 "newton"//"ampere-metre"` will be

12N/m

18N/m

0.9N/m

1.6N/m

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