What current is needed in the top wire in Figure 22.55(a) to produce a field of zero

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What current is needed in the top wire in Figure 22.55(a) to produce a field of zero at the point equidistant from the wires, if the currents in the bottom two wires are both 10.0 A into the page?
-10.0 cm- 5.00 A -10.0 cm- 10.0 A 20.0 cm-110.0 A 20.0 cm-1 20.0 cm X X 10.0 A -10.0 cm | 20.0 A5.00 A120.0

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