# Physcis questions: Why wont small metals rotate around strong magnets?

According to my primitive knowledge in physics, matter has mass, and from it's mass, it creates it's own gravitational field. For example, planets that have enormous amount of mass create gravitational fields strong enough to pull theirs moons into their orbits.

With that being said, if magnets have strong gravitational fields, why wont then smaller metals rotate around them if you give them an initial acceleration just like how the moon rotates around the earth?

Relevance
• 7 years ago

Magnetism (electromagnetic force) is not gravity.

The electromagnetic force is a trillion trillion trillion (10^36) times stronger than the gravitational force.

• 7 years ago

Magnets do not produce a gravitational field, but a magnetic field.

A mass is a "gravitational monopole": it creates a magnetic field pointing towards the mass.

There exist no such magnetic monopole: a magnet is a magnetic dipole which creates a magnetic field of much of much more complex shape, which will not allow orbiting in the general 3D case. (see the images: https://www.google.com/search?q=magnetic+dipole&tb... )

If you put a magnet under a table, perpendicular to the surface, a steel ball rolling on the table will "orbit" around the position of the magnet. This is because in the 2D plane of the table, the magnetic field has a component oriented towards the magnet.

• 7 years ago

Gravity and magnetism ARE NOT THE SAME THING! The largest magnet on Earth is nowhere near large enough to have any kind of measurable gravity. And, any gravity it would have would be overwhelmed by the gravity of the object it is next to that has billions of times more mass (namely, Earth)

Also, smaller object do not rotate around larger objects. Small objects REVOLVE around larger objects. Rotation = spin. Revolution = orbit.

.

• 7 years ago

Because magnetic field lines are curved, all starting from one pole of the magnet and looping to end at the other pole. Gravitational field lines are straight and they all start from one point (the center of mass) and extend out in straight lines in all directions to infinity without ever loping back.