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The figure below shows a wire that is made of two equal-diameter segments with resistivities p₁ and p2.
When current I passes through the wire, a thin layer of charge appears at the boundary between the
segments. Find an expression for the surface charge density o on the boundary. Give your result in terms
of I, P₁, P2, and the wire's cross-sectional area A.

A
P1
P2
O
I

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