Which one of the following physical quantities does NOT affect the res

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

[amp_mcq option1=”The current through it” option2=”Its length” option3=”The resistivity of the material used in the resistor” option4=”The area of cross-section of the cylinder” correct=”option1″]

This question was previously asked in

UPSC NDA-1 – 2017

Download PDF Attempt Online

The current through the cylindrical resistor does NOT affect its resistance.

The resistance of a resistor is a property of the material and its geometry. For a cylindrical resistor made of a homogeneous material, its resistance (R) is determined by the formula R = ρ * (L/A), where ρ (rho) is the resistivity of the material, L is the length of the resistor, and A is the area of its cross-section.

According to the formula R = ρ * (L/A), the resistance is affected by the resistivity of the material, the length, and the area of cross-section. The current flowing through the resistor is a result of the applied voltage and the resistor’s resistance (as described by Ohm’s law, V=IR). Changing the voltage changes the current, but the resistance of the resistor itself remains constant (assuming constant temperature and material properties). Therefore, the current through the resistor does not affect its resistance; rather, the resistance affects the current for a given voltage.

More similar MCQ questions for Exam preparation:-