31. At a point on the axis of a uniformly charged disk a distance zabove the center of the disk, the magnitude of the electric field is EzzR=−+LNMOQPσε21022where Ris the radius of the disk and σis the surface charge density on the disk. See Eq. 22-26. The magnitude of the field at the center of the disk (z= 0) is Ec= σ/2
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Electric charge, Fundamental physics concepts, 0.600 m, Uniformly Charged Disk, LM N, 0.346 m