(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

10C of charge are placed on a spherical conducting shell. A -3C point charge is placed at the center of the cavity. The net charge in coulombs on the inner surface of the shell is....

A. -7

B. -3

C. 0

D. +3

E. +7

2. Relevant equations

[tex]

\oint \vec{E}\cdot d\vec{a} =\frac{Q_{enc}}{\epsilon_0}[/tex]

3. The attempt at a solution

Well, I believe the E field in conducting shell is 0 and inside the cavity the field will also be zero. So, the charges must be on the inner and outer surfaces of the spherical conducting shell. It looks like I should be solving for Q(enclosed) in Gauss's law since that is the net charge but I'm not totally sure about that. I'm stuck now with what to do.

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# Gauss's law

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