A rectangular loop carrying a current $\mathrm{i}$ 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

• Correct answer
  A

  $\operatorname{ni} \mathbf{A} \times \mathbf{B}$
• B

  ni $\mathbf{A} \cdot \mathbf{B}$
• C

  $\frac{1}{n}(i \mathbf{A} \times \mathbf{B})$
• D

  $\frac{\mathrm{l}}{\mathrm{n}}(\mathrm{iA} \cdot \mathbf{B})$

Hence, the correct answer is option: 'A'.