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Two wires of same dimensions but resisti...

Two wires of same dimensions but resistivities `rho_1` and `rho_2` are connected in series. The equivalent resistivity of the combination is

A

`2(rho_1+rho_2)`

B

`sqrt(rho_1rho_2)`

C

`(rho_1+rho_2)/2`

D

`(rho_1+rho_2)`.

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