physics

Two very large parallel sheets are 5.00 cm apart. Sheet A carries a uniform surface charge density of -9.00 microcoulombs per meter squared, and sheet B, which is to the right of A, carries a uniform charge of -11.6 microcoulombs per meter squared. Assume the sheets are large enough to be treated as infinite.
A) Find the magnitude of the net electric field these sheets produce at a point 4.00 cm to the right of sheet A.
B) Find the magnitude of the net electric field these sheets produce at a point 4.00 cm to the left of sheet A.
C) Find the magnitude of the net electric field these sheets produce at a point 4.00 cm to the right of sheet B.

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