I read a couple of tutorials on electromagnetism and solenoids but theres a good few questions left unanswered. 1.) What determines the poles of a solenoid electromagnet? Lets say I have direct current flowing from the left end of the coil to the right. Will the north pole automatically be on the left end of the solenoid or the other way around? If I turn the battery around will that reverse the poles? 2.) Say I have a long circuit with the wires places side by side so the two wires run parallel. Lets say theres a heavy current running through the circuit. Battery================Resistor Since theres a small magnetic field surrounding the wire through the whole circuit and the wires are close enough that their magnetic fields overlap. Would it create 2 poles one at the battery end and one at the resistor end?