Specific resistance of copper, constantan and silver are $1.78 imes 10^{- 8},\ 39.1 imes 10^{- 8}\ and\ 10^{- 8}\ \Omega$-m respectively. Which of these is the best conductor of heat and electricity?

Question

Specific resistance of copper, constantan and silver are $1.78 	imes 10^{- 8},\ 39.1 	imes 10^{- 8}\ and\ 10^{- 8}\ \Omega$-m respectively. Which of these is the best conductor of heat and electricity?

Dr. Abubacker · Accepted Answer

(c) The best conductor of electricity is one whose resistance is least. As $R = \rho l/A$. Therefore for the given value of $l$ and $A,R \propto \rho$. Hence, silver is the best conductor of heat and electricity

Q. Specific resistance of copper, constantan and silver are $1.78 \times 10^{- 8},\ 39.1 \times 10^{- 8}\ and\ 10^{- 8}\ \Omega$-m respectively. Which of these is the best conductor of heat and electricity?

Explanation

Reviewed by Dr. Abubacker

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