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Question

The resistance of a conductor depends on the:

This question was previously asked in
RRB Group D 2024 Question Paper PDF (27-Dec-2025) (Shift 2)
The correct answer is

Length, area of cross-section, material of the conductor, and temperature

The resistance of a conductor is given by \(R = \rho \dfrac{L}{A}\), where L is the length, A is the area of cross-section and \(\rho\) is the resistivity of the material.

Resistance is directly proportional to length and inversely proportional to area of cross-section, and resistivity itself depends on the nature of the material and changes with temperature.

Voltage and current do not determine resistance; by Ohm's law R is the fixed ratio V/I and stays the same even when V and I change together.

"Length and area only" is incomplete, as it ignores the material and temperature.

Hence, resistance depends on length, area of cross-section, material of the conductor, and temperature.

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