In electronics wires that carry equal and opposite currents are often twisted together to reduce their magnetic effects and distant points why is effective
Answers
Answer:
You seem to be talking about a balanced pair. These are used for telephone and data lines as well as audio cables.
Both wires are at the same potential above Earth. The equal but opposite potentials (or 180 degree phase difference in AC) us used to create a net resultant magnetic field around the pair of zero. This means that an adjacent wire won't have any signal induced in it from the twisted pair.
The problem at the remote end is usually a summation of every magnetically induced signal in the pair from ever every meter of it's length.
So having a perfect twist and any adjacent pairs having a perfect twist should result in a complete cancellation of externally induced voltage.
Hope this makes sense to you. It's a while since I've needed to explain what is often referred to as Common Mode Rejection.