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Q60 (NDA-I/2017) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

Which one of the following physical quantities does NOT affect the resistance of a cylindrical resistor ?

Result
Your answer: —  ·  Correct: A
Explanation

The resistance (R) of a cylindrical resistor is determined by its physical dimensions and the material properties. According to the formula R = ρL/A, resistance is directly proportional to the length (L) of the conductor and the resistivity (ρ) of the material, and inversely proportional to its cross-sectional area (A) [1]. Resistivity is an intrinsic property of the material itself. While Ohm's Law (V = IR) describes the relationship between potential difference, current, and resistance, the resistance value of a specific component is a constant property determined by its geometry and material, provided the temperature remains constant [1]. Therefore, the current flowing through the resistor is a result of the applied voltage and the existing resistance; it does not change the inherent resistance of the cylindrical component itself [1].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > What you have learnt > p. 192
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