It doesn't matter both wires are made of copper. The only difference in colour is to keep the polarity the same throughout the system. Pick which colour you want to make positive and use it on all of the positive terminals.
In speaker connectors, the copper-colored connector is usually positive, and the silver-colored connector is negative.
It is traditional to use the copper colored wire as the positive. Of course, the electrons don't care what color the wire is as long as you hook it up the same at both ends!
Yes; it is tinned copper.
Whichever one you connect to the positive terminal. The colors are there so you can find the same wire at the other end.
Silver is a better conductor than copper, but copper is more commonly used because it is cheaper and isn't as easily tarnished.
no copper is more conductive YES, silver is more conductive than copper.
Of course, gold and silver, platinum. Even copper and aluminum alloys have better conductivity.
Speaker cable can have an insulator that could be any color. The wire inside is typically silver, copper or gold colored.
The price of copper today is $3.43 a pound. The price of silver today is $12.90 an ounce. Copper is much cheaper.
The best conductor of electricity is copper wire. Silver is a better conductor than copper, look up basic data. But silver is not practicable for widespread use, copper is nearly as good and more practicable for engineering use as well as cost.
Silver
Silver is the best conducting metal, both thermally and electrically. It is followed by Copper, then Gold, then Aluminum.