Question

unit 7 \physical interaction\ test which of the following has the least resistance? a short, thick metal wire a long, narrow metal wire. plastic. wood.

Explanation:

Step1: Recall resistance formula

The resistance formula is $R =
ho\frac{l}{A}$, where $
ho$ is the resistivity (material - dependent), $l$ is the length of the conductor, and $A$ is the cross - sectional area.

Step2: Analyze materials

Plastic and wood are insulators with very high resistivities compared to metals. So, they can be excluded from having the least resistance.

Step3: Analyze metal wires

For metal wires, a shorter length ($l$) and a larger cross - sectional area ($A$) result in lower resistance. A short, thick metal wire has a small $l$ and a large $A$, while a long, narrow metal wire has a large $l$ and a small $A$.

Answer:

A short, thick metal wire