Question: A uniformly charged spherical shell with surface charge density 4 contains a circular hole in its surface. The radius of the hole is small compared

A uniformly charged spherical shell with surface charge density 4 contains a circular hole in its surface. The radius of the hole is small compared with the radius of the sphere. What is the electric field at the center of the hole? (Suggestion: This problem, like Problem 64, can be solved by using the idea of superposition.)

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