Two coplanar circular loops of wire carry currents of I1 _
Chapter 19, Problem 19.98(choose chapter or problem)
Two coplanar circular loops of wire carry currents of I1 _ 5.0 A and I2 _ 3.0 A in opposite directions as in Figure P19.65. (a) If r _ 9.0 cm, what is the magnitude and direction of the net magnetic fi eld at the center of the two loops? (b) Determine the value of r such that the net fi eld at the center is zero.
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