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Two parallel wires, 5mm apart, carry currents of 100 A and 140 A respectively, in opposite...

Two parallel wires, 5mm apart, carry currents of 100 A and 140 A respectively, in opposite directions. The force per unit length in N/m of one wire on the other is:
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Answer #1

use the fact that magnetic field of one conductor will be act as a external magnetic filed for another conductor . so use the formula to calculate magnetic field.

Then simply put into the force on a conductor formula.

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