Problem on electric field and uniformly charged disk


1. Explain qualitatively how it is possible for the electric field at locations near the center of a uniformly charged disk not to vary with distance away from the disk.

2. Coulomb's law says that electric field falls off like 1/z^2. How can E for a uniformly charged disk depend on (1-z/R) or be independent of distance?

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Physics: Problem on electric field and uniformly charged disk
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