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Two metal wires of identical dimensions are connected in series. If σ1 and σ2 are the conductivities of the metal wires respectively, the effective conductivity of the combination is

(a) 2σ1σ2σ1+σ2

(b) σ1σ22σ1σ2 

(c) σ1+σ2σ1σ2  

(d) σ1σ2σ1+σ2

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