A Conducting Disk A conducting disk of radius R held at potential V sits in the x- y plane centered on the z-axis. (a) Use the charge density for this system calculated in the text to nd the potential everywhere on the zaxis. (b) Ground the disk and place a unit point charge go on the axis at z = d. Use the results of part (a) and Green's reciprocity relation to nd the amount of charge drawn up from ground to the disk