Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

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:

Options:

(A)<(B)<(C)<(D)

(D)<(C)<(B)<(A)

(B)<(A)<(D)<(C)

(C)<(D)<(B)<(A)

Correct Answer:

(D)<(C)<(B)<(A)

Explanation:

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

${(D) \lt (C) \lt (B) \lt (A)}$