A parallel plate capacitor is being charged by means of a constant current \(i.\) The plates are circular (of radius \(R)\) and are separated by a distance \(d.\) The magnetic field between the plates, at a distance \(\dfrac{R}{2}\) from the central axis is:

1.	zero	2.	\(\dfrac{\mu_{0} i}{2 \pi \left(\dfrac{R}{2}\right)}\)
3.	\(\dfrac{1}{4}\dfrac{\mu_{0} i}{2 \pi R}\)	4.	\(\dfrac{1}{2}\dfrac{\mu_0 i}{2\pi R}\)