Question

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. $ni\, A ? B$
• B. $ni\, A \cdot B$
• C. $\frac{1}{n}\left(iA\times B\right)$
• D. $\frac{1}{n}\left(iA\cdot B\right)$

Answer 1

Answer: (A)

$ni\, A ? B$

Answer 2

Torque, $T = ni (A ? B)$