First slide

Resistivity and conductivity

Question

Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity $ρ_{C}, ρ_{T}, ρ_{M}$ and $ρ_{A}$ respectively. Then

Moderate

A

$ρ_{C} > ρ_{A} > ρ_{T}$
B

$ρ_{A} > ρ_{M} > ρ_{C}$
C

$ρ_{M} > ρ_{A} > ρ_{C}$
D

$ρ_{A} > ρ_{T} > ρ_{C}$

Solution

data memory based question
$\begin{array}{l} ρ_{C} = 1.68 \times 10^{- 8} Ω m, \\ ρ_{T} = 5.6 \times 10^{- 8} Ω m, \\ ρ_{M} = 98 \times 10^{- 8} Ω m a n d \\ ρ_{A} = 2.65 \times 10^{- 8} Ω m \\ H e n c e, ρ_{M} > ρ_{A} > ρ_{C} \end{array}$

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