e/m set "Deflection of Electrons by a Magnetic or Electric Field" Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-13534
Jlab Export is a leading e/m set "Deflection of Electrons by a Magnetic or Electric Field" Manufacturer,and suppliers in India
e/m set "Deflection of Electrons by a Magnetic or Electric Field" (code EL-PL-13534) is a device for studying the principle of the cathode ray tube, with an integrated 64 x 47 mm colour touch screen and potentiometers for setting the test parameters. It covers the Thomson experiment, electron deflection in uniform magnetic or electric fields, and the e/m ratio. JLab makes it in Ambala, India, and supplies it complete with a 12 V power supply.
Specifications
| Parameter | Detail |
|---|---|
| Principle | Cathode ray tube |
| Display | Integrated 64 x 47 mm colour touch screen |
| Controls | Potentiometers for setting the test parameters |
| Experiments | Thomson experiment; electron deflection in homogeneous magnetic or electric fields; determining the e/m ratio |
| Power supply | 12 V, supplied with the device |
| Storage | Stackable case with captive lid, hinged handle, bayonet lock and foam insert |
| Quality check | Each device is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-PL-13534 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
The Thomson Method
An electron beam crossing a uniform electric field E bends towards the positive side, while a uniform magnetic field B at right angles to the beam bends it along a circular arc. When the two fields are set so that their forces cancel, the beam runs straight and its speed is v = E/B. With the electric field then switched off, the beam follows a circle of radius r, and e/m = v/(Br) = E/(B²r).
Why the Result Is a Ratio
Deflection in either field depends on the electron’s charge and mass only through e/m, so these experiments fix the ratio and not either quantity alone. Millikan’s oil-drop experiment later measured the charge itself, and the mass follows from the two results together.
Related Field and Force Experiments
- EL4 "Lorentz Force" Electricity Set — conductor plates and a coil for measuring the Lorentz force.
- Electricity EL2+ "Electrostatics, Magnetostatics, Induction, Lorentz Force" set — coils and magnets for induction and Lorentz-force work.
- Advanced Measuring Equipment for Electrical Experiments — multimeters, oscilloscope and function generator for electrical practicals.
Other modern-physics and electricity apparatus is in Physics Lab.
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Ask for the e/m set with Add To Cart or on the contact page, giving the number of units and where they are to be delivered.
Last updated: 29 October 2026
