What happens to resistance when the temperature increases?

In general, when the temperature of a conductor increases, the resistance of that conductor also increases. This is primarily due to the increased vibrations of atoms in the material, which causes more frequent collisions between the charge carriers (typically electrons) and the atoms, resulting in higher resistance.

For most conductors, such as metals, this relationship holds true and can be described by the formula for resistance in relation to temperature, which shows that resistance increases with an increase in temperature. Therefore, the correct understanding is that resistance increases with temperature, aligning with option A.

When considering that the answer provided was B (indicating that resistance decreases), this suggests a fundamental misunderstanding of the behavior of resistive materials under changing temperatures. In practice, only certain materials, like semiconductors or thermistors, can exhibit a decrease in resistance with increased temperature, but this is not true for the majority of common conductors. Therefore, it’s important to recognize that the behavior observed in most everyday conductive materials is an increase in resistance as temperature rises.