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Two metal wires of identical dimensions ...

Two metal wires of identical dimensions are connected in series. If `sigma1 and sigma2` are the conductivities of the metals respectively, the effective conductivity of the combination is

A

`(sigma_(1) sigma_(2))/(sigma_(1) + sigma_(2))`

B

`(2 sigma_(1) sigma_(2))/(sigma_(1) + sigma_(2))`

C

`(sigma_(1) + sigma_(2))/(2sigma_(1) + sigma_(2))`

D

`(sigma_(1) + sigma_(2))/(sigma_(1) sigma_(2))`

Text Solution

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The correct Answer is:
B
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