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superjen
Apr7-09, 10:37 AM
Two long, straight parallel wires are separated by a distance d. The bottom wire carries a current 22.0 A.
Point C is is at the midpoint between the wires and point O is a distance 0.700d below the bottom wire as shown. The total magnetic field at point O is zero.
What is the current, I, in the top wire?


Im completly clueless.