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Statement of a problem № 3692

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In prob. (11.50) the central part of the sphere is hollowed by creating a cavity of radius 1 R concentric with the original sphere. If the charge density of the hollowed sphere remains unchanged show that the electric field at the surface is now 7/8 of the original value on the surface.

Solution:
In prob. (11.50) the central part of the sphere is hollowed by creating a cavity

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