A parallel-plate capacitor with circular plates has a steady charging current of \(5.0 \mathrm{~A}\). The wires into and out of the plates attach to the plate centers. If the radius of each plate is \(40 \mathrm{~mm}\) and there is no dielectric between the plates, what is the magnetic field magnitude at a position that lies between the plates and is \(30 \mathrm{~mm}\) from the (imaginary) line joining their centers?