Magnetic repulsion between 2 wires?

1. The problem statement, all variables and given/known data

A wire with a weight per unit length of 0.040 N/m is suspended directly above a second wire. The top wire carries a current of 30.0 A and the bottom wire carries a current of 90.0 A. Find the distance of separation between the wires so that the top wire will be held in place by magnetic repulsion.

is this the right equation can can someone show me how to use it just leave the answer out please

2. Relevant equations

F1 / L = mg / L = (4pi x 10^-7) I2 / 2pi x distance )

3. The attempt at a solution


Science Advisor
Homework Helper
hi taylor.simon! :smile:

(have a pi: π and try using the X2 icon just above the Reply box :wink:)

find the magnetic force per length, then the magnetic force per mass …

that has to equal the gravitational force per mass …

what do you get? :smile:

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