A long straight wire is carrying current $I$ in $+z$ direction. The $x-y$ plane contains a closed circular loop carrying current $I_2$ and not encircling the straight wire. The force on the loop will be

• A

  $\mu_0 /_1 /_0 / 2 \pi$
• B

  $\mu_0 I_1 I_2 / 4 \pi$
• C

  zero
• Correct answer
  D

  depends on the distance of the centre of the loop from the wire

Solution

Situation is shown in the figure given below Thus, the force depends on the distance of the centre of the loop from the wire.

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