How To Find Current In A Wire Where Two Wires Carry Current In The Same Direction

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Question

Three wires are equally spaced along a line (perpendicular to the page) as shown in the figure. Wires A and B each carry current i into the page. When wire C carries no current, wire B experiences a force, with no other currents changed, in order or wire B to experience a force 3 in the same direction as the original, the current in wire C must be set equal to

 

 

 

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