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The equation is E=kq/r^2.

Would I use the net charge of the sphere, or do I need to calculate a new charge due to the positive one at the center?

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- Thread starter dpg1276
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- #1

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The equation is E=kq/r^2.

Would I use the net charge of the sphere, or do I need to calculate a new charge due to the positive one at the center?

- #2

BruceW

Homework Helper

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For example, if the net negative charge on the conducting sphere is exactly equal to -1 times the positive charge in the middle, then the charges cancel, and there is no electric field outside the sphere.

To find out why it works this way, you could either do an integral and Coulomb's law, or use Gauss' law, using the symmetry of the problem.

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