A wire of length 10 m carrying current of 1 A is bent in to a circular loop. If a magnetic field of $2 \pi \times 10^{-4} \mathrm{~T}$ is applied on the loop, then the maximum torque acting on it is

• A

  $100 \times 10^{-4} \mathrm{~N} \mathrm{~m}$
• Correct answer
  B

  $50 \times 10^{-4} \mathrm{~N} \mathrm{~m}$
• C

  $25 \times 10^{-4} \mathrm{~N} \mathrm{~m}$
• D

  $75 \times 10^{-4} \mathrm{~N} \mathrm{~m}$

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