You will use a Helmholtz coil pair to investigate a device under test (DUT). The coil radii are both 0.5 m.The system operates in air. a) Based on the Figure,

what is the B-field direction? b) Design the system to produce a 0.9 mT B-field at the center of the device using a 5 A current. c) Your DUT is large ("extended"), with a length dimensional = 0.2 m, as shown in the 2nd Figure. Your testing goal is uniform on-axis B-field uniformity. The DUT is centered within the Helmholtz system as shown. Evaluate the on-axis B-field over the length of the device.