An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. the radius of the loop is $a$ and distance of its centre from the wire is $d (d >> a)$. If the loop applies a force $F$ on the wire then
  • A$F = 0$
  • B$F \propto \left( {\frac{a}{d}} \right)$
  • C$F \propto \left( {\frac{a^2}{d^3}} \right)$
  • D$F \propto {\left( {\frac{a}{d}} \right)^2}$
JEE MAIN 2019, Diffcult
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