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The impedance mismatch is such that two identical waves are created at the end of the wires which are in anti phase to both the incoming current and the current launched into the room. Hence both are cancelled. However, the voltages are not cancelled and the voltage wave does escape into the room. It is responsible for hum that audio equipment is prone to unless screened.

Someone said: "Because it needs a path way in which to travel". But it has one: the air. The point is that the wire to air mismatch is so huge that the cancellation I referred to takes place and the overall current flow is zero. Talk about pathways or conductors and insulators is only a simplified way of looking at the flow of electromagnetic energy.

Anyway James Thurber's aunt reckoned it did escape and caused all sorts of problems. The escaped energy I mean, though I dare say his aunt caused a few problems as well.

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14y ago

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