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Two long straight wires are parallel and carry current in the same direction. The currents are 8.0 and 12 A and the wires are separated
by 0.40 cm. The magnetic field at a point midway between the wires is:
O OT
O 4.0 x 10-4 T
8.0 x 10-4 T
O 12 x 10-4 T
О 20 х 10-4т

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