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Complete Properties of Electrons Apparatus
Complete Properties of Electrons Apparatus (Product Code: SLE/EM/11) is a self-contained bench set for studying how a beam of free electrons behaves in electric and magnetic fields. It is built around a cathode-ray tube with a flat 75 mm screen, a pair of transverse field coils and an axial field solenoid, together with the supplies that drive them, and its instruction manual gives sample activities and sample data for six experiments ending with the determination of e/m. Manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, it serves colleges in India as a complete EM ratio apparatus and electron-optics trainer in one case.
Specifications
| Parameter | Detail |
|---|---|
| CRT overall length | 240 mm |
| CRT neck diameter | 51.4 mm |
| Flat screen diameter | 75 mm |
| Grid pitch | 10 mm |
| Electrostatic deflection | X-deflection ~±100 V; Y-deflection ~±100 V |
| Transverse field coils | Mean diameter 67 mm; 530 turns per coil |
| Axial field solenoid | Mean diameter 93 mm; length 228 mm; 1,300 turns |
| CRT cathode voltage | -750 to -1,400 V |
| Focus voltage | +200 to +400 V |
| Grid voltage | -4 to -80 V |
| Magnet supply | 0 to 9 V, 0.155 A (transverse); 0 to 7.7 V, 2.0 A (axial) |
| Power requirement | 110-V AC, 60 Hz |
| Case dimensions | 470 x 330 x 215 mm |
| Weight | ~10 kg (22 lb) |
Experiments covered by the instruction manual, with sample activities and sample data:
- Electron behaviour in an electric field
- Electron deflection in a transverse electric field
- Electron paths in an inhomogeneous longitudinal electric field
- Electron deflection in a transverse magnetic field
- Spiral electron path in a longitudinal magnetic field
- Determination of e/m
Typical Use
A practical session usually starts with the undeflected spot, then applies voltages to the X and Y plates to show that deflection is proportional to plate voltage and inversely related to beam energy. Switching to the transverse coils shows the beam bending in a magnetic field, and the axial solenoid turns the straight beam into a spiral that refocuses to a point — the basis of magnetic focusing and of the e/m measurement. Recording the cathode voltage and the solenoid current at which the spot refocuses gives the specific charge of the electron, making this a complete specific charge electron experiment with the manual’s sample data as a check on students’ results.
Allow the tube to warm up, begin with low settings and a dimmed room, and avoid leaving a bright, stationary spot on the screen for long periods. The CRT works at high voltage, so the case should be opened only by trained staff, and students should adjust the controls under supervision.
Manufacturer
Built by Jain Scientific Equipments Private Limited, the Ambala, Haryana company whose products carry the ScienceLab name, this apparatus is part of its range for undergraduate physics laboratories. More information is on the company profile page.
Related Laboratory Equipment
Alternative and companion apparatus for electron-physics practicals:
- Teltron Electron Deflection Tube D — a separate tube for the crossed-field method of finding e/m and electron velocity
- Teltron Helmholtz Pair of Coils D — coils giving a uniform magnetic field across D-series tubes
- Teltron Tube Holder D — stand for mounting D-series tubes and their coils
- Complete Zeeman Effect Apparatus — a spectroscopic route to the same electron properties
- Digital Multimeter — for independent checks of coil voltages and currents
Browse our Electricity Equipments range for more electricity and electromagnetism apparatus.
Frequently Asked Questions
Which experiments can be performed?
Six are covered in the manual: electron behaviour in an electric field, deflection in a transverse electric field, paths in an inhomogeneous longitudinal electric field, deflection in a transverse magnetic field, the spiral path in a longitudinal magnetic field, and determination of e/m.
Does it come with a manual?
Yes. The instruction manual contains sample activities and sample data for each of the six experiments.
Are the power supplies part of the apparatus?
The specification lists supplies for the CRT (cathode, focus, grid and deflection voltages) and for the transverse and axial coils. Please contact us if you need the exact scope of supply confirmed.
What mains supply is required?
The listed requirement is 110-V AC, 60 Hz. Confirm with us the configuration suited to your local mains before ordering.
How large and heavy is it?
The case measures 470 x 330 x 215 mm and the apparatus weighs about 10 kg (22 lb).
Is it safe for student use?
Yes, with supervision. The tube operates at high voltage inside the case, so students should use the external controls only.
What about warranty and calibration documents?
These terms are not in our current listing; please raise them with us through the contact page when requesting a quotation.
Can you ship to universities abroad?
Yes. We supply institutions and distributors in India and international markets.
Request a Quote
Send your enquiry for the Complete Properties of Electrons Apparatus through our contact page, or add it to the enquiry cart with any related tubes and coils.
Last updated: 24 September 2026
