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The wires of same dimension but resistiv...

The wires of same dimension but resistivities `rho_(1)` and `rho_(2)` are connected in series . The equivalent resistivity of the combination is

A

`rho_(1)+rho_(2)`

B

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

C

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

D

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

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The correct Answer is:
B
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