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## Homework Statement

Two very long, straight, parallel wires carry currents that are directed perpendicular to the page as shown in Figure P30.9. Wire 1 carries a current I1 into the page (in the -z direction) and passes through the x axis at x = +a. Wire 2 passes through the x axis at x = -2a and carries an unknown current I2. The total magnetic field at the origin due to the current-carrying wires has the magnitude 2µ0I1 / ( 2πa ). The current I2 can have either of two possible values.

Diagram: http://www.webassign.net/serpop/p22-29.gif

## Homework Equations

## The Attempt at a Solution

I needed to get this online homework done fast so I had to look up the answers and got I2 = 2*I1 and I2 = 6*I1. These were right but I have no idea how to get them and i struggled with this for about an hour now and still nothing. In my textbook also it only shows how to find the force between them. Its driving me nuts to figure this out and could really use some help on this one.