question_answer

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)  \[ni\,\mathbf{A}\times \mathbf{B}\]

B)  \[ni\,\,\mathbf{A}\cdot \mathbf{B}\]

C)  \[\frac{1}{n}\left( i\mathbf{A}\times \mathbf{B} \right)\]

D)  \[\frac{1}{n}(i\mathbf{A\times B})\]