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 : [2015 RS]
(a) σ₁ + σ₂/2σ₁σ₂
(b) σ₁ + σ₂/σ₁σ₂
(c) σ₁ σ₂/σ₁ + σ₂
(d) 2σ₁σ₂/σ₁ + σ₂
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D.> 2σ₁σ₂/σ₁+σ₂
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