Problem A5:
In the figure above are two infinitely large planes that are separated
by a distance d. Each plane is very very thin. The plane on the left
has a surface charge density
of n_{1}σ. The plane on the right has a surface charge density of
n_{2}σ. The
expression for the net electric field at a point d/3 from the left plane is
n_{3}σ/ε. What is n_{3}?

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