Electromagnetism, Induction, Lorentz Force

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 ...

Field distribution and field strength in the area around a straight conductor

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 ...

The law of induction for sinusoidal alternating fields

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 ...

Self-induction when switching a circuit on

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.

Magnetic moment in the magnetic field

Principle

A conductor loop carrying a current in a uniform magnetic field experiences a torque. This is determined as a function of the radius, of the number of turns and the current in the conductor loop and of the strength of the external field.

Tasks

Magnetic field inside a conductor

Principle

A current which produces a magnetic field is passed through an electrolyte.This magnetic field inside the conductor is determined as a function of position and current.

Tasks

Determination of the magnetic field inside a conductor as a f ...

Transformer

Principle

An alternating voltage is applied to one of two coils (primary coil) which are located on a common iron core. The voltage induced in the second coil (secondary coil) and the current flowing in it are investigated as functions of the number of turns in the coils and ...

Magnetic induction

Principle

A magnetic field of variable frequency and varying strength is produced in a long coil. The voltages induced across thin coils which are pushed into the long coil are determined as a function of frequency, number of turns, diameter and field strength.

Magnetic induction with the FG module and Cobra3

Principle

A magnetic field of variable frequency and varying strength is produced in a long coil. The voltages induced across thin coils which are pushed into the long coil are determined as a function of frequency, number of turns, diameter and field strength.