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Two parallel wires separated by 4.3 cm repel each other with a force per unit length of 1.8
Times 10^-4 Nm. The current in one wire is 5.1 A. Find the current in the other wire. Are the
currents in the same direction or In opposite directions? What would happen if the direction of
one current were reversed and doubled?
Solution
a) F/L = mu0 I1 * I2 / 2 pi r
1.8 * 10-4 = (4 pi * 10-7 * 5.0 * I2) / (2 pi * 0.043)
I2 = 7.74 A
b) Opposite directions
c) If the direction of one current were reversed and doubled the wires would attract each other

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