A long pair of insulated wires serves to conduct24.5 A of dc current to and from

Question

A long pair of insulated wires serves to conduct24.5 A of dc current to and from an instrument. A third wire is placed in the plane of the two wires shown in(Figure 1) parallel and just to the right. If it carries 27.0A upward, what force per meter of length does it exert on each of the other two wires? Assume it is2.8?mm from the nearest wire, center to center.Part D Determine the direction of the force exerted by the third wire on the left wire shown in the figure. Determine the direction of the force exerted by the third wire on the left wire shown in the figure.

Explanation / Answer

We know that,
force per unit length, F/L = meu(o)*I1*I2/2r meu(o)= 4*pi*10^(-7)

so for the closest wire F/l = (2*10^-7)*(24.5*27)/2.8*10^-3 =4.73*10^-2 N/m

For the other wire,F/L = (2*10^-7)*(24.5*27)/(2.8x10^-3 +x) N/m
                   x :- seperation between two wires(centre to centre)
                   Since figure has not been provided.

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