E/M set "Deflection of Electrons by a Magnetic or Electric Field
Product Code : SCL-PL-12309
E/M set "Deflection of Electrons by a Magnetic or Electric Field (SKU SCL-PL-12309) is a device for studying the principle of the cathode ray tube: it shows electrons being deflected in homogeneous magnetic or electric fields and allows the specific charge e/m to be determined in a Thomson-type experiment. It is intended for senior-secondary and undergraduate modern-physics labs. Science Lab Supplies in Ambala, India, can quote the set for schools, colleges, training institutes, tender contractors and distributors.
Specifications
The table gives each part of the e/m device on its own row. In short, a tube with a heated tungsten wire, a plate capacitor for the electric field and coils for the magnetic field are set through potentiometers and shown on a built-in 64 x 47 mm colour touch screen, powered by the included 12 V supply.
| Specification | Value |
|---|---|
| SKU | SCL-PL-12309 |
| Principle studied | Cathode ray tube |
| Electron source | Tube with heated tungsten wire |
| Electric field | Plate capacitor |
| Magnetic field | Coils |
| Controls | Potentiometers for setting test parameters |
| Display | Integrated colour touch screen, 64 x 47 mm |
| Experiments | Thomson experiment; deflection in homogeneous magnetic or electric fields; e/m ratio |
| Power | 12 V power supply, included |
| Case | Captive lid and built-in hinged handle |
| Lid lock | Bayonet system; stacked cases carry with one hand |
| Insert | Foam with pre-formed cavities |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the E/M Set
The set brings the classic Thomson experiment to a teaching bench: the beam can be seen to bend in an electric or magnetic field, the two fields balanced, and the settings used to calculate e/m. It is a useful addition to a physics lab equipment list class 11 and 12 and to college modern-physics practicals.
- Class 12 physics (moving charges and magnetism; dual nature of matter): force on moving charges and Thomson’s e/m experiment, after showing a capacitor’s field on the 20 cm Parallel-Plate Capacitor.
- B.Sc. physics practical: determining the specific charge of the electron, with coil fields introduced on the Induction Coils with Cores.
- Diploma and engineering physics: the working principle of the cathode ray tube.
Standard Scope of Supply
The set is supplied as one device containing the heated-wire tube, plate capacitor, coils, potentiometers and touch screen, complete with its 12 V power supply, in a stackable storage case with foam insert. Any optional items are listed on the quotation.
Packing, MOQ and Lead Time
Quotations can be prepared for one E/M set for a demonstration bench or several for student groups, each stating packing, delivery time and price for that number. Related electricity sets, an oscilloscope or radioactivity apparatus for the same modern-physics block can be listed on the same quote.
Science Lab Supplies is a registered exporter with an Importer-Exporter Code and can ship to buyers in Bangladesh, Zambia, Rwanda, South Africa, Qatar and Sri Lanka. For a price on one set or a group quantity, write through the contact page or send it from the enquiry cart; tender documents can be filed via the lab tender page.
Frequently Asked Questions
What can students measure with this set?
They can observe electron deflection in homogeneous magnetic or electric fields and determine the e/m ratio of the electron, following the Thomson experiment.
Is a power supply needed?
No separate supply is needed. The set comes complete with its 12 V power supply, and the tube, plate capacitor, coils and touch screen are all built into the one device.
How should the device be handled?
The tube uses a heated tungsten wire, so allow it to cool before packing it away and follow the instructions supplied with the set. Student use should be supervised by a teacher.
Who supplies the E/M set?
Quotations for the E/M set come from Science Lab Supplies in Ambala, India, and go directly to schools, colleges and tender contractors, with any related modern-physics items added on request.
Related Electricity, Magnetism and Modern Physics Apparatus
These Physics Lab items cover the forces on currents and magnets that lead up to the e/m experiment, the field patterns behind it, and the neighbouring modern-physics topics of the photoelectric effect and radioactivity, so they fit the same teaching sequence and can share one quotation with the set.
- EL4 Lorentz Force Electricity Set — conductor plates of different lengths and angles for six force experiments.
- Electricity EL2+ Set — AlNiCo magnets, coils and an electroscope for 21 experiments.
- Magnetic Field Demonstration Device — circular-coil and straight-conductor field apparatus with a 16 mm compass.
- Electromagnet Set — lifts a set of 9 hooked masses to link current and field strength.
- Oscilloscope — draws voltage against time; 2 MB internal memory.
- Photoelectric-Effect Apparatus — phototube with five filters from 404 to 578 nm.
- Geiger Muller Tube — alpha, beta and gamma sensitive tube, 500 V recommended bias.
- Scaler Timer — counts over 1, 10 or 100 s for GM tube work.
Browse the full Physics Lab range, the Magnetism Physics range, or all physics lab equipment.
Last updated: 22 October 2026
