MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity
On which of the following does the resistance of a conducting wire depend?
Think it through first, then pick an option.
- a Potential
- b Electric current
- c Electric field intensity
- d Area of cross-section
Answer and explanation
Correct answer: d Area of cross-section
R ∝ 1/A, so resistance depends on the area of cross-section.
Why the other options are wrong
- a Potential: Potential does not decide the resistance; it depends on length, cross-section, material and temperature.
- b Electric current: Current does not determine resistance; resistance is a property of the wire itself, R = ρL/A.
- c Electric field intensity: Electric field intensity is not a factor in the book; resistance depends on L, A, ρ and temperature.
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