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Find the magnetic field on the z axis at z +8.0 cm if (a) the currents...

Find the magnetic field on the z axis at z +8.0 cm if (a) the currents are both in the -x direction and (b) the current in the wire at y -6.0 cm is in the -x direction and the current in the wire at y +6.0 cm is in the +x direction.

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