In 1862, James Clerk Maxwell published his famous Maxwell’s equations. This was at a time when humans were just starting to play around with batteries and electric currents. The first two of these ...

When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right). Likewise, a wire passing through a magnetic field creates an electric current ...

Earth’s trusty magnetic field has been keeping the planet safe for at least 3.7 billion years. There’s a chance it might have ...

And all these little dust grains have little magnetic fields associated with them, because all the grains are made of electric charges and they're spinning around themselves. When light from distant ...

An electromagnet forms when electric current flows through a wire and produces a magnetic field around the wire. This essential link between electricity and magnetism was discovered by Hans ...

It is a common grade school experiment to wind some wire around a screw ... The coil is fed with AC. The magnetic field from the coil induces an opposite field in the copper ring that is out ...

Plotting compasses can also be used to see the magnetic field around a solenoid. To make a loudspeaker cone vibrate correctly, the electric current must vary in the same way as the desired sound.

And all these little dust grains have little magnetic fields associated with them, because all the grains are made of electric charges and they're spinning around themselves. When light from ...