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ch22_p31 - 31 At a point on the axis of a uniformly charged...

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31. At a point on the axis of a uniformly charged disk a distance z above the center of the disk, the magnitude of the electric field is E z z R = + L N M O Q P σ ε 2 1 0 2 2 where R is the radius of the disk and σ is 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 E c = σ /2
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