Question

Which changes would cause an increase in the resistance of a wire? Check all that apply.

increasing its temperature
decreasing its temperature
using a longer wire
using a shorter wire
using a thicker wire
using a thinner wire

Answer 1

- Increasing its temperature — increases resistivity for ordinary metal wires, so R goes up.
- Using a longer wire — R ∝ L, so longer means larger R.
- Using a thinner wire — R ∝ 1/A, so smaller cross‑section (thinner) raises R.

The other choices (decreasing temperature, shorter wire, thicker wire) would decrease resistance.