Physics Lab Equipment

LEAI-48 Lorentz Force Demonstrator

LEAI-48 Lorentz Force Demonstrator

Features

  • Complete apparatus

  • Compact and stable

  • Affordable



Introduction


The LEAI-48 Lorentz Force Demonstrator is a compact teaching apparatus designed to help students explore fundamental principles of electromagnetism through direct observation and measurement. It provides a clear and practical demonstration of the Lorentz force—the force exerted on charged particles, such as electrons, when they move through electric and magnetic fields. This fundamental concept underlies a wide range of physical phenomena and modern technologies, from cathode-ray tubes and oscilloscopes to particle accelerators and mass spectrometers. 


In the experiment, a beam of electrons is generated and accelerated, then subjected to external magnetic and electric fields. By observing the resulting deflection of the electron beam, students can visualize how the Lorentz force governs the motion of charged particles. Through careful measurement of the beam’s deflection, the apparatus can also be used to determine the specific charge (e/m) ratio of the electron, an important constant in physics first measured by J.J. Thomson at the end of the 19th century. 


With its affordable design, robust construction, and easy operation, the LEAI-48 provides an ideal platform for laboratory instruction in electromagnetism. It enables students not only to confirm key theoretical principles but also to gain hands-on experience with experimental techniques and data analysis. 


Please click Experiment Theory and Contents to find more information about this apparatus.


Specifications

DescriptionSpecifications 
Number of turns per coil140
Diameter of Helmholtz coils28 cm
Accelerating voltage0 ~ 250 V continuously adjustable
Magnetizing current0 ~ 1.8 A continuously adjustable
Current flow directionClockwise, Off, Counterclockwise
Deflecting voltage50 V ~ 250 V continuously adjustable
Voltage polarityPositive at upper-plate, Off, Positive at lower-plate
Dual display volt-ammeter Digital LCD, DC 0 ~ 600 V, 1%; DC 0 ~ 3.0 A, 1%


Parts List

DescriptionQty
Main unit1
Dual display volt-ammeter 1
Power cord1
Instruction manual 1

Lorentz Force Demonstrator.png

Orbit of moving electrons in magnetic field

LEAI-48-1.JPG

Measure accelaration voltage & coil current using a digital meter

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