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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > 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

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

A thin bar magnet of length 2 L is bent at the mid - point so that the angle between them is 60 degree. The new length of the magnet is