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Question

Two metal wires of identical dimensions are connected in series. If δ1 and δ2 are the conductivities of the metal wires respectively, the effective conductivity of the combination is

A
2δ1δ2δ1+δ2
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B
δ1+δ22δ1+δ2
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C
2δ1+δ2δ1+δ2
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D
δ1δ2δ1+δ2
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