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A circular currernt loop of magentic mom...

A circular currernt loop of magentic moment M is an arbitrary orientatio in an external magnetic field B. The work done to rotate the loop by `30^@` about an axis perpendicular to its plane is:

A

(a) MB

B

(b) `sqrt3(MB)/2`

C

(c) `(MB)/2`

D

(d) Zero.

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