1. The problem statement, all variables and given/known data A 0.200-A current is charging a capacitor that has circular plates 10.0 cm in radius. If the plate separation is 4.00 mm, (a) what is the time rate of increase of electric field between the plates? (b) What is the magnetic field between the plates 5.00 cm from the center? 2. Relevant equations Ampere-Maxwell law: integral(B*ds) = u0I + e0u0*d(fluxE)/dt 3. The attempt at a solution I have found the solution to part A, but B is what is causing me trouble. I have really no clue how to go about finding the magnetic field.