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Conductivity and resistivity: Ohm's law


The circuit shown below has two cylindrical conductors, A and B, of radii, rA=a, and rB=3a respectively, connected in series.
The electric fields in the two conductors, |EA| and |EB|, are such that |EA|=9|EB|.
How are the conductivities, σA and σB, related?
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