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← ScienceWhich mechanism causes signal attenuation in a coaxial cable at ultra-high frequencies?
A)Dielectric losses from molecular polarization✓
B)Skin effect increasing conductor resistance
C)Impedance mismatch causing reflections
D)Electromagnetic interference from external sources
💡 Explanation
At ultra-high frequencies, the alternating electric field causes molecular polarization within the dielectric material to lag behind the applied field, resulting in energy dissipation as heat and signal attenuation. Therefore, dielectric losses lead to attenuation, rather than skin effect, impedance mismatch, or interference which have different mechanisms.
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