The strength of the magnetic field around a wire is greatest closest to it. Fleming's left hand rule shows that changing the direction of the current in a straight wire or a solenoid reverses the ...

Even a straight piece of wire will have some degree of inductance ... Therefore, a changing current produces a changing magnetic field around the wire. To further intensify the magnetic field, the ...

In 1820 Hans Christian Ørsted announced his discovery that the flow of an electric current through a wire produced a magnetic field around the wire. André-Marie Ampère followed on and showed that the ...