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A rectangular loop carrying a current i ...

A rectangular loop carrying a current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by

A

`nI vecA xx vecB`

B

`nI vecA. vecB`

C

`1/n(1 vecA xx vecB)`

D

`1/n(I vecA. vecB)`

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