Why is the electrical length of a coaxial cable longer than its physical length?
Skin effect is less pronounced in the coaxial cable
Skin effect is more pronounced in the coaxial cable
Electromagnetic waves move faster in coaxial cable than in air
Electromagnetic waves move more slowly in a coaxial cable than in air✓Bonne réponse
Explication
The dielectric slows the wave, so it covers less physical distance during one cycle inside the cable than it would in air. A given physical length therefore represents more degrees — more wavelengths — of electrical length than the same distance in free space.