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← ScienceWhich mechanism causes reduced power transmission efficiency in long underwater power cables?
A)Dielectric absorption of electrical energy✓
B)Ohmic heating overwhelming cable cooling
C)Galvanic corrosion weakening cable structure
D)Electromagnetic interference cancelling current
💡 Explanation
Dielectric losses increase as cable length increases in alternating current systems because polarisation lags voltage, causing the Polarization mechanism. Therefore option A best describes lower efficiency, rather than solely resistive heating or corrosion which are less frequency-dependent.
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