The parallel-plate capacitor in Figure 30.25 has circular plates of radius \(R\) and is charged with a current of constant magnitude \(I\). The surface is bounded by a circle that passes through point \(\mathrm{P}\) and is centered on the wire leading to the left plate and perpendicular to that wire. The surface crosses the left plate in the middle so that the top half of the plate is on one side of the surface and the bottom half is on the other side. Use this surface and Eq. 30.6 to determine the magnitude of the magnetic field at point \(\mathrm{P}\), which is a distance \(r=R\) from the capacitor's horizontal axis.

Data from Figure 30.25

Data from Eq. 30.6

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R E