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Two rods of identical lengths and cross ...

Two rods of identical lengths and cross sectional area are connected in series. If `sigma_1` and `sigma_2` is the thermal conductivity of material of two rods then equivalent conductivity of combination is equal to

A

a. `(2 sigma_1 sigma_2)/(sigma_1 +sigma_2)`

B

b. `(sigma_1 sigma_2)/(sigma_1 +sigma_2)`

C

c. `(2 sigma_1 sigma_2)/(sigma_1 - sigma_2)`

D

d. `(2 sigma_1 sigma_2)/(sigma_1 - sigma_2)`

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