1. The problem statement, all variables and given/known data If I have a 24 volt power supply.The positive lead is attached to a disk and the negative lead is attached to another. The disks are separated by about 24 cm. The disks are on a sheet of carbon impregnated paper. Is the charge on the disk 24 volts? I am trying to determine the electric field strength at a point directly in the middle of the two disks. E= 2*8.99x10^9*q/r^2 but I am not sure what the charge is on the sphere.