1.

Two metal wires of identical dimensions are connected in series. If sigma_(1) and sigma_(2) are the conductivities of the metal wires respectively, the effective conductivity of the combination is

Answer»

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

ANSWER :B


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