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 a applies a force F on the wire then :

Question

$F = 0$

$F \propto \left( {{a \over d}} \right)$

$F \propto \left( {{{{a^2}} \over {{d^3}}}} \right)$

$F \propto {\left( {{a \over d}} \right)^2}$

Solution

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