Question

Three long wires are parallel to the z axis. These are represented as the three dots shown below. The currents are out of the page, and they are all the same value. They form an equilateral triangle of side length 0.5 m. If a fourth wire is placed at point b which is also parallel to the z-axis, and bisects the horizontal base of the triangle, what magnitude of current will result in the magnetic force on the top wire a to be zero? 5.
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