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Two metal wires of identical dimensions ...

Two metal wires of identical dimensions are connected in series. If `sigma_1` and `sigma_2` are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

A

`sigma_1+sigma_2`

B

`(sigma_1sigma_2)/(sigma_1+sigma_2)`

C

`(2sigma_1sigma_2)/(sigma_1+sigma_2)`

D

`(sigma_1+sigma_2)/(2sigma_1sigma_2)`

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