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OpenStudy (anonymous):

A hollow metal sphere has 5cm and 9cm inner and outer radii, respectively. The surface charge density on the inside surface is −200nC/m2. The surface charge density on the exterior surface is +200nC/m2.

OpenStudy (anonymous):

What is the strength of the electric field at point 4 cm from the center?

OpenStudy (anonymous):

Gauss's law indicates the E field is proportional to the sum of the enclosed charge. No enclosed charge within r = 4cm.

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