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twisting wires reduces inductance

Robby,
A twisted pair has lower inductance than the same two wires individually.

Inductance arises from the magnetic field that surrounds a wire carrying current. The effect of that magnetic field is in effect to impose a resistance on the current in the wire; further, the amount of inductance-generated resistance increases with increasing frequency. When you twist the wires together, the inductively-generated magnetic fields partially cancel (because the currents are flowing in opposite directions in the two wires), so there is less high-frequency roll-off.

Peter



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