An infinitely long straight wire carrying a current `I_1` is partially surrounded by a loop as shown in Fig. The loop has a length L, radius R, and carries a current `I_2` The axis of the loop coincides with the wire. Calculate the force exerted on the loop.

An infinitely long straight wire carrying a current `I_1` is partially

1.	An infinitely long straight wire carrying a current `I_1` is partially surrounded by a loop as shown in Fig. The loop has a length L, radius R, and carries a current `I_2` The axis of the loop coincides with the wire. Calculate the force exerted on the loop.
Answer» Net force on circular parts will be zero because magnetic force produced by `I_1` on these parts will be tangent at any point. On straight parts, forces will be in same direction. Net force=`2[(mu_0)/(4pi) (2I_1I_2)/R L]=(mu_0I_1I_2L)/(piR)`

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