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May 30, 2015

Homework Help: Physics

Posted by Sean on Friday, December 25, 2009 at 11:07pm.

A negative charge -Q is placed inside the cavity of a hollow metal solid. The outside of the solid is grounded.

Q: Is there any excess charge induced on the inner surface of the piece of metal?
A: Yes, +Q

Q: Is there any excess charge on the outer surface of the metal?
A: No

Q: Is there an electric field in the cavity?
A: Yes

I understand the first two. The +Q induced charge to match the -Q charge, and the outer part of the metal is neutralized. However, I don't understand the third. Wouldn't the electric field from the -Q and the field fromt the +Q induced charge cancel each other out?

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