Electromagnetic fields are a combination of invisible electric and magnetic fields of force.
They are generated by natural phenomena like the Earth's magnetic field but also by human activities, mainly through the use of electricity.
Electromagnetic field, a property of space caused by the motion of an electric charge.
A stationary charge will produce only an electric field in the surrounding space.
If the charge is moving, a magnetic field is also produced.
An electric field can be produced also by a changing magnetic field.
An electric field (sometimes E-field) is the physical field that surrounds electrically-charged particles.
It exerts force on all other charged particles in the field, either attracting or repelling them.
It also refers to the physical field for a system of charged particles.
Electric field is defined as the electric force per unit charge.
The direction of the field is taken to be the direction of the force it would exert on a positive test charge.
The electric field is radially outward from a positive charge and radially in toward a negative point charge.
Since electric field is a vector quantity, it can be represented by a vector arrow.
For any given location, the arrows point in the direction of the electric field and their length is proportional to the strength of the electric field at that location.
Because positive charges repel each other, the electric field around an isolated positive charge is oriented radially outward.
When they are represented by lines of force, or field lines, electric fields are depicted as starting on positive charges and terminating on negative charges.
If the charge is negative,
field lines point radially towards it.
Electric field of negatively charged particle points radially toward the particle.
The magnetic field is the area around a magnet in which there is magnetic force.
Moving electric charges can make magnetic fields.
Magnetic fields surround magnetized materials, and are created by electric currents such as those used in electromagnets, and by electric fields varying in time
In physics, the magnetic field is a field that passes through space and which makes a magnetic force move electric charges and magnetic dipoles.
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. ...
Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation.
On Earth, flowing of liquid metal in the outer core of the planet generates electric currents.
The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet. The magnetic field is extremely important to sustaining life on Earth.
The tesla (symbol T) is the derived SI unit of magnetic flux density, which represents the strength of a magnetic field.
One tesla represents one weber per square meter.
Magnets have two poles, a north pole and a south pole.
The magnetic field is represented by field lines that start at a magnet's north pole and end at the south pole.
When most people think of magnetism, they think about the magnetic force experienced between two magnets.
An electromagnetic field, sometimes referred to as an EM field, is generated when charged particles, such as electrons, are accelerated.
All electrically charged particles are surrounded by electric fields.
Charged particles in motion produce magnetic fields.
The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. ...
The force created by the electric field is much stronger than the force created by the magnetic field.
In electromagnetism and electronics, electromotive force (emf, denoted. and measured in volts) is the electrical action produced by a non-electrical source.
The magnetomotive force, mmf, is analogous to the electromotive force and may be considered the factor that sets up the flux.
The mmf is equivalent to a number of turns of wire carrying an electric current and has units of ampere-turns.