Q73 / 90 · JEE Main 2009 · Physics

Due to the presence of the current $\mathrm{l}_1$ at the origin

  • A
    The forces on $A B$ and $D C$ are zero
  • Correct answer
    B
    The forces on $A D$ and $B C$ are zero
  • C
    The magnitude of the net force on the loop is given by $\frac{\mu_0 I_1}{4 \pi}\left[2(b-a)+\frac{\pi}{3}(a+b)\right]$
  • D
    The magnitude of the net force on the loop is given by $\frac{\mu_0 \|_1}{24 a b}(b-a)$

Solution

The forces on $A D$ and $B C$ are zero because magnetic field due to a straight wire on $A D$ and $B C$ is parallel to elementary length of the loop.

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

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