Generating a Magnetic Field
Generating a Magnetic Field Scientists think, although not certain, there are two essential ingredients for generating a magnetic field. Those two ingredients are
- magnetic material
A bar of iron can be made into a magnet by wrapping it with wires and running a current through the wires.
It is believed a planet, or a star, can generate a magnetic field if it has both of the two ingredients above. It must have enough magnetic material, and it must have currents moving inside the magnetic material. If a planet does not have enough of either of these two ingredients, it will not have a magnetic field. Planets which do not have magnetic fields include Venus (moves very slowly), and Mars (most the iron is on the surface, and not molten).