h34r: What's up y'all. I was reading an electronics book(Electronics Technology Fundamentalss-Robert T. Paynter & B.J. Toby Boydell p.281) about inductors and two sentences I read popped a question mark in my head: 1. "The current through a wires produces magnetic lines of force". 2. "When a wire is wrapped in a series of loops called a coil, the lines of force generated by the current add together to form a magnetic field." Does this mean that a wire has to be wrapped in a coil to produce a magnetic field? If so why? I alway though wire with a current sent through it produced a magnetic field and vice versa regardless if the wire was wrapped in a coil or not.