The amount of resistance offered by a conductor depends on the conductor's size and length.

• A. True
• B. False
• C. It depends on temperature
• D. It depends on the material

Answer: (A)

Resistance is determined by how much material electrons have to traverse and how easily they can move through it. For a uniform material, R equals ρ times L divided by A (R = ρL/A). This means longer length makes resistance larger, while a larger cross-sectional area lowers resistance. So, for a given material and temperature, the size (cross‑section) and length directly control the resistance.

The statement is true because those geometric factors are the primary way the conductor’s size and length influence resistance. Temperature and the material itself also affect resistance through resistivity, but they don’t negate the fact that longer length increases resistance and a thicker cross-section reduces it.