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Two wires of equal length and equal diam...

Two wires of equal length and equal diameter and having resistivities `rho_(1)`and `rho_(2)` are connected in series. The equivalent resistivity of the combination is _______.

A

`(rho_(1) + rho_(2))/(2)`

B

`(rho_(1) + rho_(2))`

C

`(rho_(1)rho_(2))/(rho_(1) + rho_(2))`

D

`sqrt(rho_(1)rho_(2))`

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