Others, on the contrary, have supposed earth currents to be a direct effect of changes in the earth's magnetic field.
Oersted's discovery of the interaction of a magnetic field and an electric current.
Induced electric currents, known as eddy currents, occur when a solid metallic mass is rotated in a magnetic field.
Any space at every point of which there is a finite magnetic force is called a field of magnetic force, or a magnetic field.
A wire carrying an electric current is surrounded by a magnetic field, and if the wire is bent into the form of an elongated coil or spiral, a field having certain very useful qualities is generated in the interior.
Accompanying the creation of the current is the production of a magnetic field, that is, the surrounding space is made the seat of magnetic action.
As was pointed out first by von Helmholtz, vortex-filaments correspond to circuits carrying currents and the velocity in the surrounding fluid to magnetic field-intensity.
The current can be measured in terms of the already known unit of current, that current which flowing in a circle of radius unity produces a magnetic field at the centre of 2π units.
The operation of an induction motor depends on the production of a magnetic field by passing an alternating current through field magnets.
On account of the speed given to the coil of wire its atoms enter suddenly this magnetic field, and they give off crowds of electrons in a flash.
When a magnetic field is applied, however, the rays are deflected, as shown in the lower diagram.
When a magnetic field is applied the rays are seen to be deflected, as in the diagram.
The intensity of the sound was greatly increased when the iron was placed in a magnetic field.
Within very recent years the discovery of a magnetic field in sun spots has been made by Hale with powerful instruments of his own design.
It was with this instrument that Hale discovered the effect of an electro-magnetic field in sun spots which has revolutionized solar theories, a research impossible to conceive of without the aid of photography.
As it is known that electrons are emitted by hot bodies, they must be present in vast numbers in the sun; and positive or negative electrons, if caught and whirled in a vortex, would produce a magnetic field.
In the transformer the currents are generated by magnetic field of very low density, in which the lines are moving across the conductor with extreme rapidity.
This reasoning is based on the possibility in this case of cutting off the current in the magnetizing coil and retaining the magnetic field.
An atom must, then, be thought of as having polarity, different qualities on the two sides, and possessing a magnetic field as extensive as space itself.
The shape of a magnet does not necessarily make it weaker or stronger as a magnet, but if the poles are near together the magnetic field is denser between them than when they are separated.
Light can be deflected by passage through a magnetic field.
It would take a whale of a magnetic field to have done THAT--it's inconceivable.
When, in the cataclysm, that force was diffused there had been created a magnetic field of incredible intensity; had been concentrated an electric charge of inconceivable magnitude.
For example, if an inactive conducting wire is moved through a magnetic field; it will have concentric circular whirls set up around it; or, in other words, it will have a current generated in it as a result of such motion.
In this investigation Faraday proved that light-vibrations are rotated by the action of a magnetic field.
Any space traversed by lines of magnetic force is called a magnetic field.
The fact that there is a magnetic field surrounding a conductor in which there is a current can be shown by a simple experiment, as illustrated in Fig.
A simple experiment to illustrate the fact that there is an induced electrical pressure set up in a conductor when it is moved in a magnetic field may be performed as follows: Take a wire, AB, as shown in Fig.
Picture a host of us attached to copper atoms in a coil of wire which is being moved through that disturbed aether called a magnetic field.
He found that when a coil of wire was moved through a magnetic field, there was a current of electricity induced in the moving coil.
The moving electrons disturb the aether around the wire and produce what we know as a "magnetic field.
When the incidence is more oblique than this, the rotation of the plane of polarization is in the opposite direction to the electric currents which would produce a magnetic field of the same sign.
When the light is polarized in the plane of incidence, the rotation is at all angles of incidence in the opposite direction to that of the currents which would produce a magnetic field of the same sign as the magnet.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "magnetic field" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
