excess charge is uniformly distributed over the plane top surface of a large solid conductor. if the electric field above the charged surface is 1.5NC , Determine the surface charge density on the comductor surface

True Or False?

1) A solid metallic conductor in the shape of a football is given a net positive charge.
The excess positive charge, as predicted by Gauss's law, is uniformly distributed over the surface of the conductor.


2) An excess charge Q is added to an isolated metal object of irregular shape.
No matter how you change the shape of this metal object,
this excess charge will always be found on its outside surface if it remains isolated.

3) Two spheres contain the same charge Q, but one sphere is twice the diameter of the other. The electric flux through the surface of the larger sphere is 4 times as great as the flux through the smaller sphere.

The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 3.1 x 105 N/C. What is the surface charge density on the drum, assuming that the drum is a conductor?