Arrange the following materials in increasing order of their resistivities.
(A) Tungsten
(B) Aluminium
(C) Gold
(D) Copper
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (D)<(C)<(B)<(A)
Resistivities at 20°C (approx):
$\text{Copper} \; \rho \approx 1.68 \times 10^{-8}\ \Omega m$
$\text{Gold} \; \rho \approx 2.44 \times 10^{-8}\ \Omega m$
$\text{Aluminium} \; \rho \approx 2.82 \times 10^{-8}\ \Omega m$
$\text{Tungsten} \; \rho \approx 5.6 \times 10^{-8}\ \Omega m$
Increasing order: Copper < Gold < Aluminium < Tungsten
${(D) \lt (C) \lt (B) \lt (A)}$