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Question

why is anticlockwise moment taken positive and clockwise negative

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Solution

It follows from general convention which is handed down to us from generations and is universally accepted. Anohter reason could be that...

A charge particle be it an electron or a proton would move along a circular path in uniform magnetic field. However the direction of motion would depend upon the magnitude of charge as positive charge would move in an anti-clockwise orbit while a negative charge would move in a clockwise orbit.


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