The magnetization of ferromagnets. The electromagnet.

When the magnetization of paramagnetic and diamagnetic magnetic induction varies in direct proportion to the field strength. In figure. 22.25 показана зависимость магнитной индукции парамагнетиков (μ>1) и диамагнетиков (μ<1) on the magnetic field; отклонения графиков от прямой B=μ0H для вакуума (μ = 1) for clarity greatly exaggerated. The magnetization of the ferromagnet occurs otherwise (rice. 22.26). Сначала при увеличении напряженности Н индукция очень […]

Magnetic field as a particular kind of matter

We will refer to the field, through which the interaction of electric currents, located at a distance, magnetic field. Experience has shown, that magnetic field creates a moving electric charges or variable electric field acts only on moving charges. So, to detect magnetic field in any region of space, you need to make in the area of the conductor or any other moving charges. […]

The phenomenon of electromagnetic induction

Installed, electric current and its magnetic field always exist simultaneously. Faraday, knowing of the close relationship between current and magnetic field, was sure, with the help of magnetic field can be created in a confined conductor of electrical current. He conducted numerous experiments and proved it, opening in 1831 g. the phenomenon of electromagnetic induction. Appearance in a closed electrical conductor, […]

E. d. with. induction, emerging in the straight conductor when it moves in a magnetic field. The right-hand rule.

Let a uniform magnetic field with induction B is a straight metallic conductor of length l (rice. 23.1). If this conductor be set in motion at a speed of ν so, the angle α between the vectors B and ν was 90°, together with the conductor will be directed to move by its own electrons. Since their motion occurs in a magnetic field, […]

The magnetic field energy

The magnetic field energy of the circuit depends on the current in her and from her form. Check this dependency. Remember, что энергия магнитного поля цепи Wмаг равна работе, which is expended to overcome the e. d. with. self-induction, occurs when closing the circuit. If the average value e. d. with. самоиндукции при этом равно Ɛc, а по цепи за время нарастания […]

The phenomenon of self-induction. E. d. with. self-induction

Remember, what self-magnetic field in a DC circuit is changed at moments of actuation and de-actuation circuit, and if you change it current. This means, in these moments in the chain must occur e. d. with. induction. The appearance of e. d. with. induction in the circuit, which is caused by the change of the magnetic field, текущего в этой […]

Vortex electric field and its relation with the magnetic field

The emergence of E. D. with. induction in a straight conductor, moving in a magnetic field, it was explained by the action of the Lorentz force on the moving charge carriers. However, to explain in this way the appearance of e. d. with. induction in the secondary circuit when it is stationary relative to the primary circuit (it was impossible, since there is no magnetic field on resting charges. Remember, resting on the charge acts the electric field. […]

The Lenz's law for electromagnetic induction

Induction current generates its own magnetic field. The relationship between the direction of the induction current in the circuit and the inducing magnetic field was installed Lenz. In the experience, depicted in figure. 23.3, induction current in the solenoid creates a magnetic field, the poles of which are indicated in the bore of the solenoid. Tracing the interaction between the magnetic poles of the solenoid and magnet in all four cases, shown in the figure, and […]

The value of e. d. with. induction

When performing experiments of Faraday can be seen, that the galvanometer needle is deflected the further, the faster moves in the magnet or solenoid coil with current. The same thing happens, if we strengthen the magnetic field of primary coil, increase in the current. A detailed study of this phenomenon showed, that e. d. with. induction, arising in any chain, прямо пропорциональна скорости изменения потокосцепления […]

A uniform magnetic field

The magnetic field inside the solenoid (rice. 22.7) it is characteristic not only for those, that the lines are parallel. It turns out, the induction vectors at all points of this field are identical in magnitude and direction. Such a field is called homogeneous. The number of lines of induction per unit cross-sectional area, perpendicular to the lines of induction, in this case, the same everywhere. Therefore, расстояния между соседними линиями индукции в однородном поле […]