Two plates are being discharged by a constant current. Each plate has a radius of 4.00 cm. Through the discharging, at a point among the plates at radial distance 2.00 cm from the central axis, the magnetic field has a magnitude of 12 nT.
1) What is the current in the wires attached to the plates?
2) What is the magnitude of the magnetic field at a radial distance 6.00 cm?