Électromagnétisme, Induction et Force de Lorentz

The forces between the primary and secondary coils

Principle

This experiment demonstrates the force on a closed conductor in which current is being induced. Using DC in the primary coil, there is a pulse as the power is turned on and the coil is forced away. Using AC, the coil hovers over the primary coil.

Model of a high voltage long distance line

Principle

When electrical energy is transmitted over long distances, it is unavoidable that there will be losses due to resistance in the lines. Using transformer stations and high-voltage transmission lines can drastically reduce such losses. To model such lines, two wires o ...

Galvanometer

Principle

This galvanometer kit can be used to demonstrate to students the principle design features and functioning of a galvanometer.

Current-carrying conductors in magnetic fields

Principle

If a current-carrying conductor is inside a magnetic field produced by a magnet, then there will be an interaction between the two magnetic fields, whereby both the magnet and the conductor will exert forces on one another.

Dependence of the Lorentz force on the current intensity, conductor length and field direction

Principle

The Lorentz force acting on a straight conductor in a magnetic field is proportional to the current and to the length of the conductor. The direction of the force is determined by the direction of the current and the direction of the magnetic field (right-ha ...

Loi sur la distance de la densité du flux magnétique

Principle

The magnetic flux density in the field of a straight conductor is inversely proportional to the distance from the conductor. In the experimental set-up pictured here, a high-current transformer generates an alternating current of approximately 100 A, which flows ...

La loi d'induction pour les champs alternatifs sinusoïdaux

Principle

The voltage induced is proportional to the number of windings and to the surface area of the induction coil. For sinusoidal alternating fields, it is also proportional to the current and to the frequency of the current generating the field.

Waltenhofen Pendulum

Principle

When a massive body made of conductive material moves through a magnetic field, eddy currents are induced. According to Lenz’s law, the body is then subjected to a force which is opposed to the cause of the eddy currents, i.e. the motion of the pendulum. The b ...

Rotary motion by turbulent flow - principle of the alternating current meter

Principle

A metal disc rotates on a bearing-mounted shaft in the presence to two out-of-phase alternating magnetic fields. Eddy currents are induced in the disc and forces are imparted onto this current-carrying conductor. Out-of-phase alternating fields also cause the r ...

Eep 10.1

Principle

A coil is located in a DC circuit. When the circuit is closed, the magnetic field of the coil builds up and generates a self-induction voltage which counteracts the increase.  An incandescent lamp in the circuit lights up only gradually.

Moment magnétique dans un champ magnétique

Champ magnétique à l'intérieur d'un conducteur

Champ magnétique à l'intérieur d'un conducteur

Principle

A current is passed through an electrolyte producing a magnetic field. This magnetic field inside the conductor is measured as function of position and current by determining the induction voltage.

Tasks

Determine ...

Le transformateur

Induction magnétique avec compteur