Asked by Anonymous

Three wires lie in a plane, placed parallel to one another and equally spaced by 0.20 m. If the wires are oriented up and down on
the page, the right-hand wire carries 100 A to the top, the middle wire 300 A to the bottom, and the left-hand wire carries 200 A to the top. What are the forces per unit length on each of the wires?

Answers

Answered by Chanz
Ugh. Such tedium...
First find the magnetic field exerted by the other two wires:
B = (mu)i/2pi r
for example for the 2nd on the left wire-
B = pi4e-7(300)/2pi(.2)
(you can cancel the pi's)
Sum the two B fields (they're opposite direction so careful)
Next find the force/length
F/L = IB
Lather rinse repeat
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