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Which 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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