Two coplanar and concentric circular loops of wire carry
Chapter 30, Problem 64(choose chapter or problem)
Two coplanar and concentric circular loops of wire carry currents of I 1 5 5.00 A and I 2 5 3.00 A in opposite directions as in Figure P30.64. If r1 5 12.0 cm and r2 5 9.00 cm, what are (a) the magnitude and (b) the direction of the net magnetic field at the center of the two loops? (c) Let r1 remain fixed at 12.0 cm and let r2 be a variable. Determine the value of r2 such that the net field at the center of the loops is zero.
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