Consider a uniform electric field pointing directly up with a magnitude of 250 N/C. What is the magnitude of the electric flux through a flat rectangular surface of dimensions 3 cm by 5 cm when it is (a) horizontal with its normal vector pointing straight up, (b) vertical with its normal vector point to the right, and (c) tilted so its normal vector makes an angle of 45° with respect to the electric field vector. (d) horizontal with its normal vector pointing straight down.
If the electric field in a region of space is zero, can you conclude there is no net electric charge in that region? Can you conclude that there are no charges at all in the region? Explain.