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Mathematics 8 Online
OpenStudy (anonymous):

Two wires separated by a distance of 22 cm carry currents in the same direction. The current in one wire is I1 = 1.5 A, and the current in the other wire is I2 = 4.5 A. The current I2 is adjusted until the magnetic field 6.5cm below wire 2 has a magnitude of 2.9×10−6T and points out of page. Everything else in the system remains the same.

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