When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right ... and generators to operate. In the Earth (see image below right), the ...

Electricity and magnetism were imprinted into our surroundings from the beginning. Five billion years ago when the new-born Earth was a hot plasma of swirling electrical currents, these flows ...

Essentially, the molten iron at the core of our planet helps to determine where Earth’s magnetic field downs down. A diagram showing how the Earth’s magnetic field points downward and also how ...