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1. An isolated spherical conductor has an excess charge of -8.6 ?C placed on its surface....

1. An isolated spherical conductor has an excess charge of -8.6 ?C placed on its surface. Inside the conductor is a cavity, within which is a point charge of 2.20 ?C. How many excess electrons are on the exterior surface of the conductor ?

2. Now, an additional 6.0 ?C is placed on the exterior of the sphere in the above problem. What will the total electric flux through a cubical gaussian surface drawn outside the sphere be?

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Answer #1

1). Since no charge can reside inside the cavity of the conductor thus the point charge will come over its surface. Hence total charge on the surface of the conductor will be

  

Now, charge on an electron is

  

Then number of electrons on the exterior surface of the conductor is

(ANS)

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