Two coplanar circular loops of wire carry currents ofI1 = 5.4 A andI2 = 2.9 A in oppositedirections as in the figure below.
(a) If r = 9.2 cm, what is the magnitude and direction of the netmagnetic field at the center of the two loops?
1correct check mark
2 µT

(b) Determine the value of r such that the net field atthe center is zero.
3 cm


Detailed answers to tough
homework problems