The propagation velocity of an electromagnetic wave in a cable, depends on the cable lenght (like traveling through the cable) or in the distance between the measurments (like speed of causality)?
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clarifications. 1) fibre optic cable (electicity is not EM wave). 2) what measurements exactly? – JMLCarter Nov 29 '17 at 13:11
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Why would the velocity depend on the cable length or on a distance between measurements? It is a property of the cable which comes from its properties like the material used for the cable etc. – jfeis Nov 29 '17 at 13:11
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Check this out: https://physics.stackexchange.com/questions/358894/speed-of-light-vs-speed-of-electricity/358900#358900 – safesphere Nov 29 '17 at 15:01
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Generally speaking speed depends on the properties of the cable, mainly its refractive index. In fibre optics refractive index can vary with radius, helping signals to traverse curves. The distance over which the velocity is measured is not relevant in the general case.
JMLCarter
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