A magnet can attract or repel objects even before they ... The energy of the falling water turns turbines which spin round, generating electricity. Iron fillings reveal a magnet's magnetic field.

How a Generator Works When an electric current flows through a wire, it generates a three-dimensional magnetic force field around the wire, similar to that surrounding a bar magnet. Magnets are ...

They are affected by magnets and are attracted to either pole of a magnet ... They can let go of the car by turning off the current. Electric bells use electromagnets. When the electromagnet ...

Attached to the circuit with folding arms is a stack of two permanent magnets, which work as the ... one centimeter off the table like a little electric grasshopper. This is far from [Carl ...

we first need to establish an electric field. It's like a magnetic field: just as the opposite poles of two magnets attract each other, so do the positive and negative charges in an electric field.