# Question: What Is A Magnetic Field Made Of?

## Why do magnetic fields exist?

Magnetic fields occur whenever charge is in motion.

As more charge is put in more motion, the strength of a magnetic field increases.

Magnetism and magnetic fields are one aspect of the electromagnetic force, one of the four fundamental forces of nature..

## What is H in magnetic field?

The definition of H is H = B/μ − M, where B is the magnetic flux density, a measure of the actual magnetic field within a material considered as a concentration of magnetic field lines, or flux, per unit cross-sectional area; μ is the magnetic permeability; and M is the magnetization. …

## Where is the strongest magnetic field in a coil?

Bar Magnet As can be visualized with the magnetic field lines, the magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are near the poles. A magnetic north pole will attract the south pole of another magnet, and repel a north pole.

## Why can’t magnetic field lines cross?

Magnetic field lines can never cross, meaning that the field is unique at any point in space. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole.

## Can light be deflected by magnetic fields?

For a magnetic field to change the path of something, that thing has to have an electric charge and photons don’t. … Since you can think of a sufficiently energetic photon as equivalent to an electron-positron pair, that photon could in fact be deflected by magnetic field. This is called the Delbrucke effect.

## Is magnetic field made of matter?

Normally we wouldn’t call any of these fields “matter”, but it is true that the electric and magnetic fields which surround a charged object like an electron do store energy, and therefore have a rest mass, via E=mc^2 (in a reference frame in which the electron has no momentum).

## What is a magnetic field and what is its source?

Magnetic Field. Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. The magnetic field B is defined in terms of force on moving charge in the Lorentz force law.

## How magnetic field is created?

As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion. The spinning and orbiting of the nucleus of an atom produces a magnetic field as does electrical current flowing through a wire. The direction of the spin and orbit determine the direction of the magnetic field.

## What is magnetic field in simple words?

The definition of a magnetic field is a place in space near a magnet or an electric current where a physical field is created from a moving electric charge that creates force on another moving electric charge. An example of a magnetic field is the Earth’s magnetic field.

## What is in a magnetic field?

A magnetic field is a vector field that describes the magnetic influence of electric charges in relative motion and magnetized materials. … Magnetic fields surround and are created by magnetized material and by moving electric charges (currents) such as those used in electromagnets.

## What is an example of a magnetic field?

Examples of magnetic force is a compass, a motor, the magnets that hold stuff on the refrigerator, train tracks, and new roller coasters. All moving charges give rise to a magnetic field and the charges that move through its regions, experience a force.

## Do magnetic fields have mass?

magnetic fields are produced by charged particles in motion, and depend on the charge and velocity of these particles, but not on their mass. Magnetic fields are ‘polar’ fields with a North and South polarity. Gravitational fields have no polarity at all.

## Are photons affected by electric field?

Grahame- You’re right that electromagnetic waves, whether viewed classically or in terms of quantized photons, are not affected by static electrical or magnetic fields. They have no charge. … Photons are little units of light — they are the original “quanta” of quantum mechanics.

## Is the Earth’s core magnetic?

The core of the Earth is also an electromagnet. Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and nickle. The magnetic field of Earth is caused by currents of electricity that flow in the molten core.

## Where is a magnetic field strongest?

north poleThe magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.

## Can you block a magnetic field?

There is no known material that blocks magnetic fields without itself being attracted to the magnetic force. Magnetic fields can only be redirected, not created or removed. To do this, high-permeability shielding alloys are used. The magnetic field lines are strongly attracted into the shielding material.

## Why is B used for magnetic field?

One finds the ‘B’ used most often with MRI systems and is seen as dB/dt which is an expression of the change in amplitude over the change in time. ‘B’ being the amplitude or intensity of the field.

## Are photons affected by magnetic fields?

According to theory of properties of photon, they can not be affected by electric and magnetic fields and it is neutral. But Electromagnetic waves contain electric and magnetic fields .