PhysicsEasy226×since 2002Q6519Two metallic wires of identical dimensions are connected in series. If σ1\sigma_{1}σ1 and σ2\sigma_{2}σ2 are the conductivities of the these wires respectively, the effective conductivity of the combination is :Aσ1σ2σ1+σ2\frac{\sigma_{1} \sigma_{2}}{\sigma_{1}+\sigma_{2}}σ1+σ2σ1σ2B2σ1σ2σ1+σ2\frac{2 \sigma_{1} \sigma_{2}}{\sigma_{1}+\sigma_{2}}σ1+σ22σ1σ2Cσ1+σ22σ1σ2\frac{\sigma_{1}+\sigma_{2}}{2 \sigma_{1} \sigma_{2}}2σ1σ2σ1+σ2Dσ1+σ2σ1σ2\frac{\sigma_{1}+\sigma_{2}}{\sigma_{1} \sigma_{2}}σ1σ2σ1+σ2Check answerSkip