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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 X_1 rho_2 X_2)/( X_1 +X_2)`

B

`(rho_1 X_2 +rho_2 X_1)/( x_1-X_2)`

C

`(rho _1 X_2 +rho_2 X_1 )/( X_1 +X_2)`

D

`(rho_1 X_1 + rho_2 X_2 )/( X_1 -X_2)`

Text Solution

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The correct Answer is:
A
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