Two long straight aluminum wires, each of diameter 0.40 mm, carry the same current but in opposite directions. They are suspended by 1.0-m-long strings as shown in the figure. If the suspension strings make an angle of 4.0° with the vertical and are hanging freely, what is the current in the wires? (density of aluminum = 2.7 g/cm³, g=9.80 m/s²) 80 12
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