I need thin wire but all i have is a thin guitar string, would that work?
It might work, but you won't find it easy to solder to. Steel wire has a much higher resistance per foot than copper. I would wait until I could get some proper copper wire.
No it doesn't. A steel guitar string is designed to vibrate under tension. It is not a very good conductor, and does not bend or cut easily.
No, salvage some old electrical items you no longer need for copper wiring and use that
No! Guitar strings (as Lare says) are steel which is a poor conductor. Furthermore there is no insulation on a guitar string - the plastic coating on real electrical wire that prevents short circuits.
it won't make a very good wire because its conductivity is poor. electrical wires are made from copper for a reason. copper stretches like crazy if pulled hard, so it doesn't work in guitars either. guitar strings are strong in tensile, but they are not very flexible. also, being steel, they can't be readily soldered, so how do you plan to attached it to anything? it could only be used in clamp type connectors. the third problem for a connection that is to be long term, attaching dissimilar metals (copper/steel) generates a chemical reaction which leads to very rapid corrosion. corroded metal is a very poor conductor of electricity.