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Suppose in the figure that I1 = I2 = 21 A and that the separation between the wires is 0.018 m.

Suppose in the figure that I1 = I2 = 21 A and that the separation between the wires is 0.018 m. By applying an external magnetic field (created by a source other than the wires) it is possible to cancel the mutual repulsion of the wires. This external field must point along the vertical direction. What is the magnitude of the external field?

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