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Two metal wires of identical dimension are connected in series. If σ1 and σ2 are the conductivities of the metal wires respectively, the effective conductivity of the combination is :
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σ1 + σ2 2σ1σ2 -
σ1 + σ2 σ1σ2 -
σ1σ2 σ1 + σ2 -
2σ1σ2 σ1 + σ2
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Correct Option: D
In figure, two metal wires of identical dimension are connected in series
