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Let us model this as two infinite slabs of charge, both of thickness a with the...

Let us model this as two infinite slabs of charge, both of thickness a with the junction lying on the plane z = 0 . The N-type material lies in the range 0 < z < a and has uniform

charge density +ρ0 . The adjacent P-type material lies in the range −a < z < 0 and has uniform charge density −ρ0 . Thus:

p(z) = {

+p0 0<z<a

-p0 -a<z<0

0 |z|>a

}

(a) Find the electric field everywhere.

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