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My Question:

A rectangular loop of wire lies in the same plane as a straight wire, as show in Fig. 20-57. There is a current of 2.5A in both wires. Determine the magnitude and direction of the net force on the loop.

http://www.webassign.net/pse/p31-09.gif" [Broken]

where the width is 10.cm and width of the box is 5.0 cm and distance from the rectangular loop and the straight wire is 3.0 cm.

My Work

F=((mu constant)(I)^2(length))/(2pi(distance))

F=((4pi x 10^-7 Tm/A)(2.5A)^2(.10m))/(2pi(.05m))

F=2.5 x 10^-6 N

but the answer in the back of the book gives F=2.6 x 10^6

What did I do wrong

Thank You

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# Force between two wires

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