Chapter 21, Problem 21.89P

Repeat Problem 21.88 for the case where sheet B is positive.

21.88     Two very large parallel sheets are 5.00 cm apart. Sheet A carries a uniform surface charge density of −8.80 μC/m², and sheet B, which is to the right of A, carries a uniform charge density of −11.6 μC/m². Assume that the sheets are large enough to be treated as infinite. Find the magnitude and direction of the net electric field these sheets produce at a point (a) 4.00 cm to the right of sheet A; (b) 4.00 cm to the left of sheet A; (c) 4.00 cm to the right of sheet B.