Question

which most likely has the greatest conductivity?
a warm plastic rod
a cool rubber tube
a cool silver strip
a warm copper wire

Explanation:

Step1: Recall conductivity of materials

Conductivity is the ability of a material to conduct electricity. Metals are generally good conductors, while plastics and rubbers are insulators.

Step2: Compare metal options

Silver and copper are both metals. Silver has a very high electrical conductivity, but copper is also an excellent conductor and is widely used in electrical wiring. Temperature can also affect conductivity to some extent, but the difference due to a small - temperature change (warm vs cool) is not as significant as the difference between materials. Silver has a higher conductivity than copper at the same temperature, but the "warm" condition of the copper wire might not be enough to overcome the inherent conductivity difference between silver and copper at normal conditions.

Step3: Eliminate non - metal options

Plastic and rubber are insulators and have very low conductivity compared to metals.

Answer:

a cool silver strip