Three long wires are parallel to a z axis, and each carries a current of 9.1 A i

Question

Three long wires are parallel to a z axis, and each carries a current of 9.1 A in the positive z direction. Their points of intersection with the xy plane form an equilateral triangle with sides of 35 cm, as shown in the figure. A fourth wire (wire b) passes through the midpoint of the base of the triangle and is parallel to the other three wires. If the net magnetic force on wire a is zero what is the current (in A) in wire b? Take current in the positive z direction to be positive and current in the negative z direction to be negative.

Explanation / Answer

13.65 A in negative z direction

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