Question
Identify the conductor having the lowest resistivity.
This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
Silver
Conductor Resistivity Explained
Resistivity (\( \rho \)) is an intrinsic property of a material that measures how strongly it resists electric current. A lower resistivity indicates a better conductor, meaning it allows current to flow more easily with less energy loss.
Resistivity Comparison Table
The approximate resistivities of the given conductors at room temperature (around 20°C) are:
| Conductor | Resistivity (\( \rho \)) at 20°C (\( \Omega \cdot m \)) |
|---|---|
| Silver | \( 1.59 \times 10^{-8} \) |
| Copper | \( 1.68 \times 10^{-8} \) |
| Aluminium | \( 2.65 \times 10^{-8} \) |
| Iron | \( 9.71 \times 10^{-8} \) |
Identifying Lowest Resistivity Conductor
Comparing the resistivity values:
- Silver has the lowest resistivity (\( 1.59 \times 10^{-8} \, \Omega \cdot m \)).
- Copper has a slightly higher resistivity (\( 1.68 \times 10^{-8} \, \Omega \cdot m \)).
- Aluminium's resistivity is higher still (\( 2.65 \times 10^{-8} \, \Omega \cdot m \)).
- Iron has the highest resistivity among the options (\( 9.71 \times 10^{-8} \, \Omega \cdot m \)).
Therefore, the conductor with the lowest resistivity is Silver.
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Similar Questions
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Important Questions from Resistivity of Various Materials
Which of the following graph correctly represents the variation of resistivity 's' with temperature 'T' for a semiconductor material ?
- The resistivity of a conductor depends on the _______.
The correct sequence of increasing order of electrical resistivity of the given material is-
- Identify the conductor having the lowest resistivity.
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