Two metal wires of identical dimensions are connected in series. If \\sigma_{1} and \\sigma_{2} are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

Correct Answer is : 2σ1σ2σ1+σ2

{\\sigma_{1} \\sigma_{2}}/{\\sigma_{1}+\\sigma_{2}}

{2 \\sigma_{1} \\sigma_{2}}/{\\sigma_{1}+\\sigma_{2}}

{\\sigma_{1}+\\sigma_{2}}/{2 \\sigma_{1} \\sigma_{2}}

WBJEE 2021 Physics and Chemistry Solved Paper

Category II (Q31 to Q 35)

Carry 2 marks each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ½ mark will be deducted

Question : 31 of 80

Marks: +1, -0

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

σ1+σ2
σ1σ2
σ1+σ2
2σ1σ2
σ1+σ2
σ1+σ2
2σ1σ2

Validate

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