Two electricity wires run in the North-South direction along a suburban street. Their separation is d = 78 cm and, at the moment we reconsidering, they are carrying a current of 59 A (in opposite directions, of course). At a point midway between the two wires, what is the direction of the total magnetic field due to the two wires? The section of cable between two posts is L = 45 m long. What is the magnetic force between the wires? At point midway between the two wires, what is the magnitude of the total magnetic field due to the two wires?

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