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A point charge -Q is at the center of a spherical conducting shell of inner radius R1 and outer radius R2 as shown in th...

A point charge -Q is at the center of a spherical conducting shell of inner radius R1 and outer radius R2 as shown in the figure below. (In the figure there is a around spherical where 2 arrows shoots out from and arrow R1 is distance to the innter radius and R2 is to the outer radius) What is the charge on the inner surface of the shell?
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Answer #1

tghe charge on the inner surface will be +Q (to balance the inner negative charge

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Answer #2

The answer is +Q. The negative Q induces a +Q on the inside of the sphere.

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Answer #3

please post the fig

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