This Refresher from 29.5 A Current-Carrying Coil as a Magnetic Dipole will help you get familiar with prerequisite concepts The gure below shows four arrangements of circular loops. The small loops have a radius of 0.0299 m and the large loops have a radius twice as large and they are all carrying a current of 269 A in the direction shown. The coils are separated vertically by a distance of 0.0386 m. What is the magnitude of the magnetic eld at the location midway between the loops in conguration (a)? n T c) Q Q | (a) (b) (C) (d)