A sheet of charge lies flat (horizontal) on a tabletop, and a point charge is fixed in place floating4cm above the sheet of charge. The sheet of charge is 1 m by 1 m -- large enough that it can be treated as an infinite sheet -- and has a total charge of +8C. The point charge has a value of +8C. What direction is the net electric field at a point halfway between the point charge and the sheet of charge? If the net electric field at this point is 0, select "No direction -- zero electric field".

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No direction -- zero electric field Explain your reasoning, but without referring to any calculations of the electric field.

Now calculate the magnitude of the electric field at the halfway point. Usek=9.0010⁹Nm²/C². Magnitude = __________ N/C