The wire of length $l$ is bent into a circular loop of a single turn and is suspended in a magnetic field of induction $B$. When a current $I$ is passed through the loop, the maximum torque experienced by it is

• Correct answer
  A

  $\left(\frac{1}{4\pi }\right)BI{l}^2$
• B

  $\left(\frac{1}{4\pi }\right)B{I}^{2}l$
• C

  $\left(\frac{1}{4\pi }\right)BIl$
• D

  $\left(\frac{1}{4\pi }\right)B^{2}Il$

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