I'm having trouble understanding metals and conductors in relation to gauss's law. For example if there is a sphere with a charge on it, and a cavity inside with another charge, what happens...

Question

anonymous · Answer

try this video... http://www.youtube.com/watch?v=BcuQ2c_WrMc

anonymous · Answer

Electric field inside a charged CONDUCTOR  always HAS  to be ZERO.

So, there will be charges induced on the inside surface of the conductor i.e. These charges will be taken from the surface of the charged conductor itself.

Watch the course videos (Prof. Walter Lewin - 8.02). Explains very well.