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[" 4.An infinitely long current-carrying...

[" 4.An infinitely long current-carrying wire and a small "],[" current-carrying loop are in the plane of the paper as shown."],[" Theradius 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 "],[qquad [qquad 1+0],[" (a) "F prop((a^(2))/(d^(3)))F=0quad " (c) "F prop((a)/(d))F prop((a)/(d))^(2)]]

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