Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity ρ C, ρ T, ρ M and ρ A respectively. Then: (a) ρ C > ρ A > ρ T (b) ρ M > ρ A > ρ C (c) ρ A > ρ T > ρ C (d) ρ A > ρ M > ρ C

Answer: (b). Approximate resistivities at room temperature: ρC ≈ 1.7 × 10⁻⁸, ρA ≈ 2.7 × 10⁻⁸, ρT ≈ 5.6 × 10⁻⁸, ρM ≈ 98 × 10⁻⁸ Ω m. Order: ρM > ρT > ρA > ρC. Only option (b) ρM > ρA > ρC fits this order. So the answer is (b).

Consider four conducting materials copper, tungsten, mercury and… | JEE Main 2020 (2 Sep, Shift 1)

Q38JEE Main 2020 · 2 SEP · SHIFT 1Easy

Ohm's Law, Resistivity & Temperature

Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity $\rho$ C, $\rho$ T, $\rho$ M and $\rho$ A respectively. Then:

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Answer: (b)

Approximate resistivities at room temperature: $\rho_C \approx 1.7 \times 10^{-8}$ , $\rho_A \approx 2.7 \times 10^{-8}$ , $\rho_T \approx 5.6 \times 10^{-8}$ , $\rho_M \approx 98 \times 10^{-8}\ \Omega\text{ m}$ .
Order: $\rho_M > \rho_T > \rho_A > \rho_C$ .
Only option (b) $\rho_M > \rho_A > \rho_C$ fits this order.
So the answer is (b).

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Ohm's Law, Resistivity & Temperature question from JEE Main 2020 (2 Sep, Shift 1)

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