Two wires of equal diameters of resistiv...

Two wires of equal diameters of resistivies `rho_(1)` and `rho_(2)` and lengths l and l respectively are joined in series. The equivalent resistivity of the combination is

A

`(rho_1l_1+rho_2l_2)/(l_1+l_2)`

B

`(rho_1l_2+rho_2l_1)/(l_1-l_2)`

C

`(rho_1l_2+rho_2l_1)/(l_1+l_2)`

D

`(rho_1l_1+rho_2l_2)/(l_1-l_2)`

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The correct Answer is:

A

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