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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 vec(A) xx vec(B)`

B

`ni vec(A).vec(B)`

C

`(1)/(n)(ivec(A)xx vec(B))`

D

`(1)/(n)(ivec(A).vec(B))`

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