Find I2 so that the magnetic force per unit length on each wire is zero. The three parallel wires are equally spaced. Current directions are shown with '<' or '>'.(adsbygoogle = window.adsbygoogle || []).push({});

I1 = I3 = 1 A

< I1 < I1 < I1

---------------

> I2 > I2 > I2

---------------

< I3 < I3 < I3

---------------

I have the formula F = (mu0*I*I')/(2*pi*r) with mu0 = 4*pi*10^-7 but have no clue where to take this to figure out I2 with the 3 wires.

Sorry if this is really easy but I'm not too quick with Physics. Thanks for any help.

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# Homework Help: Magnetic force between 3 straight wires

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