A 0.230-A current is charging a capacitor that has circular plates 10.0 cm in radius. (a) If the plate separation is 4.00 mm, what is the time rate of increase of electric field between the plates? (b) What is the magnitude of the magnetic field between the plates 5.00 cm from the center? So... I know the formula for displacement current, which is I = e(flux/dt) = e(EA/t). I'm not sure how to get the electric field from the given information. I need some help for this. Thx in advance!