MCQ
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$F \propto \left( {\frac{a^2}{d^3}} \right)$
- ✓$F \propto {\left( {\frac{a}{d}} \right)^2}$
