Answer and explanation:
The right answer is b) "The excess charge has distributed itself evenly over the outside surface of the sphere".
The hollow metal sphere is a conductor. This means that charges can move freely over its surface. On the other side, a metal body act as an equipotential body. Once some charge is set and there is no voltage differential imprinted over the body, to keep being an equipotential body the charges must distribute evenly on the external surface. Must not exist charge in the volume, or would exist an electrical field and therefore a voltage differential. Also, the charge distribution in the internal surface must be null. If you apply gauss theorem with a gaussian sphere with a radius between the internal and external surface, knowing that field E is null, the enclosed charge must be null.
Answer:
They do this because it covers the whole surface which they are cleaning. the cleaner all hold the same charge and repel from each other and cover the whole surface. They want to do this to make sure the item that they cleaning is clean.
Answer:
C. 1 month
Explanation:
The moon orbits around the earth once in a time of 27.322 days and it also takes about 27 days to orbit around its own axis. Due to this the moon is not seem to be spinning and it always seems still to observer who is observing from the Earth.
The moon takes about almost 1 month to make 1 revolution around the Earth . It also takes approximately the same time to make one rotation about its axis. This is why we always see the same face of the moon.
The answer in for the picture is investigation 4
