Two coplanar and concentric circular loops of wire carry currents of I, = 6.10 A and I, = 2.30 A in opposite directions as in the figure below. Let r, = 12.0 cm and r, = 8.80 cm. (Assume the positive direction along the axis perpendicular to the faces of the loops is out of the screen (towards you) and assume the positive vertical direction is toward the top of the screen.) (a) What is the magnitude of the net magnetic field (in pT) at the center of the two loops? HT (b) What is the direction of the net magnetic field at the center of the two loops? O out of the screen O into the screen O toward the top of the screen O toward the bottom of the screen (c) Let r, remain fixed at 12.0 cm and let r, be a variable. Determine the value of r, (in cm) such that the net field at the center of the loops is zero. cm

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