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What is the conductivity of Copper?

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in Design of Electrical Machines by (687k points)
What is the conductivity of Copper?

(a) 0.6329*10^6 mho/cm

(b) 0.5952*10^6 mho/cm

(c) 0.4529*10^6 mho/cm

(d) 0.3773*10^6 mho/cm

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The doubt is from High Conductivity Materials topic in division Electrical Engineering Materials of Design of Electrical Machines

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The correct choice is (b) 0.5952*10^6 mho/cm

For explanation: 0.6329*10^6 mho/cm relates to the conductivity value of Silver. 0.4529*10^6 mho/cm  relates to the conductivity value of Gold and 0.4529*10^6 mho/cm  relates to the conductivity value of Aluminum.

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