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Which mechanism causes higher impedance in a coaxial cable at resonance?

A)Travelling wave amplitude modulation
B)Standing wave impedance transformation
C)Skin effect at high impedance
D)Dielectric losses exceeding input power

💡 Explanation

Standing wave impedance transformation creates localized voltage and current peaks, because constructively interfering waves produce maxima; therefore the impedance appears high due to voltage maximum, rather than energy dissipating via dielectric losses or signal modulation.

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