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Two identical metal wires of thermal con...

Two identical metal wires of thermal conductivities `K_(1)` and `K_(2)` respectively are connected in series. The effective thermal conductivity of the combination is `:`

A

`(K_(1) + K_(2))/( K_(1) K_(2))`

B

`(K_(1)K_(2))/( K_(1) + K_(2))`

C

`(2K_(1) K_(2))/( K_(1) + K_(2))`

D

`(K_(1) + K_(2))/( 2K_(1) K _(2))`

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