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.

Treatment with electromagnetic therapy usually comes ... your magnetic fields are out of balance. If you put a magnetic field near your body, it's believed things will go back to normal.

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 ...

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 ...

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 ...

It keeps the solar wind away from the top of our atmosphere, preventing it from scrubbing our atmosphere away, and reduces ...

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 ...