An infinitely long wire carrying a 25-A current in the positive x-direction is placed along the x-axis in the vicinity of a 20-turn circular loop located in the x€“y plane as shown in Fig. 5-37 (P5.11 (a)). If the magnetic field at the center of the loop is zero, what is the direction and magnitude of the current flowing in the loop?

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1m d = 2m Figure P5.11: (a) Circular loop next to a linear current (Problem 5.11).