There is a parallel-plate capacitor with circular plates of radius 4.00 cm is charging with a constant current of 1.80 mA. The plates are separated by vacuum. (a) Calculate the induced magnetic field halfway between the plates, due to Maxwell's Displacement Current, at a radius of 1.0 cm. (b) Find the magnetic field at a radial distance 8.0 cm from the axis of the capacitor, still at a longitudinal position halfway between the plates, but now radially outside the plates