Final answer:
The coaxial cable has the smallest diameter . In problem 69, the coaxial cable has an inner radius of 0.25 cm, which is smaller than the diameter of the 0-gauge copper wire in problem 25.
Step-by-step explanation:
The cable with the smallest diameter is the one with the smallest radius.
In problem 69, the coaxial cable has an inner radius of 0.25 cm, which is smaller than the diameter of the 0-gauge copper wire in problem 25.
Therefore, the coaxial cable has the smallest diameter.