Question

Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity ρ_C, ρ_T, ρ_M and ρ_A respectively. Then:

Options

• ρ_C > ρ_A > ρ_T

• ρ_A > ρ_T > ρ_C

• ρ_A > ρ_M > ρ_C

• ρ_M > ρ_A > ρ_C

Answer 1

ρ_M > ρ_A > ρ_C

Explanation:

Given:

Resistivity of copper is ρ_C resistivity of tungsten is ρ_T resistivity of mercury is ρ_M and resistivity of aluminium is ρ_A.

To find: Arrange the given resistivities in correct order.

We know,

ρ_C = 1.7 × 10^-8 Ω m

ρ_T = 5.6 × 10^-8 Ω m

ρ_M = 98 × 10^-8 Ω m

ρ_A = 2.6 × 10^-8 Ω m

From the above data:

P_M > P_T  > P_A > P_C