# Why do magnetic forces exist?

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Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. … Their movement generates an electric current and causes each electron to act like a microscopic magnet.

## What are magnetic forces used for?

Computer hard drives use magnetism to store the data on a rotating disk. More complex applications include: televisions, radios, microwave ovens, telephone systems, and computers. An industrial application of magnetic force is an electromagnetic crane that is used for lifting metal objects.

## Why does magnetic force do no work?

Because the magnetic force on a moving charge is perpendicular to the velocity, the work done by a magnetic force is zero. An interesting example of this is the case of a rotating wheel carrying point charges in a magnetic field: … The coil on the left makes a magnetic field to the right.

## What causes magnetic repulsion?

If two magnetic south poles or two magnetic north poles are brought near each other, the magnetic force is repulsive and the magnets will push against each other in opposite directions. If opposite poles are brought near, it is attractive. But the fundamental origin of the magnetic field is moving charge.

## What are the two magnetic forces?

The most elementary force between magnets, therefore, is the magnetic dipole–dipole interaction. If all of the magnetic dipoles that make up two magnets are known then the net force on both magnets can be determined by summing up all these interactions between the dipoles of the first magnet and that of the second.

## What are the 4 magnetic metals?

Magnetic metals include:

• Iron.
• Nickel.
• Cobalt.
• Some alloys of rare earth metals.

## Is any work is done by magnetic force?

The magnetic field does no work, so the kinetic energy and speed of a charged particle in a magnetic field remain constant. The magnetic force, acting perpendicular to the velocity of the particle, will cause circular motion.

## Do magnets have the ability to do work?

In our high school physics, we learn that magnetic force does not do work. But why do bar magnet stick together. Our hands feel force and they really move in that direction. … So it acts just like any other potential energy term, and is responsible for work.

## Is magnetic force conservative?

Accordingly, some authors classify the magnetic force as conservative, while others do not. The magnetic force is an unusual case; most velocity-dependent forces, such as friction, do not satisfy any of the three conditions, and therefore are unambiguously nonconservative.

## How do magnets repel and attract?

Magnets are surrounded by an invisible magnetic field that is made by the movement of electrons, the subatomic particles that circle the nucleus of an atom. … Magnets attract when a north pole is introduced to a south pole. If like poles are introduced, either north to north or south to south, the magnets repel.

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## Why do magnets repel or attract?

All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.

## Do magnets have a positive and negative end?

Magnets can also attract each other, but only if they face in opposite directions. A magnet has two ends called poles; one end is the north pole and the other is the south pole. … Magnets seem to act something like positive and negative electric charges. Electricity and magnetism are very closely related.

## Where is a magnetic field the strongest?

the closer the lines, the stronger the magnetic field (so the magnetic field from a bar magnet is strongest closest to the poles) the lines have arrowheads to show the direction of the force exerted by a magnetic north pole.

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## What forces can a magnet exert?

The force that a magnet exerts on certain materials, including other magnets, is called magnetic force. The force is exerted over a distance and includes forces of attraction and repulsion. North and south poles of two magnets attract each other, while two north poles or two south poles repel each other.