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Magnetism with Two Wires

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Two wires, each having a weight per unit length of 10^-4 N/m, are strung parallel, one 0.1 m above the other. If the wires carry the same current, through in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?

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For a wire, the magnetic field around it is B=(u*I)/(2Pi*r). Therefore, the ...

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