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Three long parallel wires each carry 2.0-A currents in the same direction.The wires are oriented vertically,and they pass through three of the corners of a horizontal square of side 4.0 cm.What is the magnitude of the field at the fourth (unoccupied) corner of the square due to these wires? (μ0 = 4π × 10-7 T ∙ m/A)
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