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## Homework Statement

11. Two parallel conductors, 1.0 cm apart, each carry 10 A of current in opposite directions. What is the magnetic field strength at the midpoint between these wires?

## Homework Equations

B = μI/ 2πr

## The Attempt at a Solution

I know that the magnetic field is doubled because the currents are in opposite directions.

Should r = 0.01 m or 0.005 m?

Is the r the distance between the two wires? I thought that r is the perpendicular distance from the wire to the point of field measurement, so that would mean 0.005 m.

I think the answer in my book is wrong, because it has r = 0.01 m.

Please advise.