e and m by Magnetic Focusing Method Manufacturer,Supplier and Exporter in India
Product Code : EL-EMA-1070
Jlab Export is a leading e and m by Magnetic Focusing Method Manufacturer,and suppliers in India
e and m by Magnetic Focusing Method (code EL-EMA-1070) is a bench kit for studying the charge of the electron, as e/m, by focusing a cathode ray beam with a magnetic field. A 3-inch CRT sits on a teak wood stand with a ring-type solenoid that slides over it, powered by a high-voltage supply with intensity, focus, X and Y deflection and solenoid current controls. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Get a quote: use the Add To Cart enquiry button below, or send your quantity and destination through the contact page.
Specifications
| Parameter | Detail |
|---|---|
| Experiment | To study the charge of an electron (e/m) by the magnetic focusing method |
| Power supply | High-voltage power supply with intensity, focus, X and Y deflection and solenoid current controls |
| Meters | Two: acceleration voltage and solenoid current |
| Cathode ray tube | One 3-inch CRT mounted on a teak wood stand |
| Solenoid | Ring-type solenoid that slides over the CRT |
| Dimensions | 11 x 7 x 4 in (about 28 x 18 x 10 cm) |
| Quality check | Each kit is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-EMA-1070 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with the Other Solenoid e/m Kits?
| Model | Electron source | Solenoid | What students look for |
|---|---|---|---|
| This kit (EL-EMA-1070) | 3-inch CRT on a teak wood stand | Ring-type, slides over the CRT | The trace on the screen focusing to a spot |
| e and m by Helical Method Solenoid Method | CRT movable inside the solenoid | Standard multi-layer solenoid on a wooden base, coarse and fine current control | The trace focusing to a spot |
| e and m by Short Solenoid Method Magnetron Method | Magnetron sliding into the solenoid pipe | Short solenoid | The anode current cutting off at a critical field |
Choose this kit when you want the CRT controls — intensity, focus and X and Y deflection — on the same supply as the solenoid current, with the beam in plain view on a compact stand. The helical unit puts the tube inside a multi-layer solenoid, and the magnetron kit replaces the CRT with a valve and a current cut-off reading.
What Is the Magnetic Focusing e/m Kit Used For?
It gives undergraduate physics students a direct way to measure the specific charge of the electron. The X or Y deflection control spreads the beam so that it draws a line on the screen. When current flows in the ring solenoid, its field acts on the electrons’ sideways motion and the line rotates and shortens; at the right current it shrinks to a sharp spot, because the electrons are brought back together at the screen. Students record the acceleration voltage and the solenoid current at focus and, with the solenoid data and the tube geometry from their practical manual, calculate e/m.
The kit fits B.Sc. physics and engineering physics practical courses and works well as a lecture demonstration of how magnetic fields steer and focus electron beams, the same idea used in electron microscopes and older CRT displays. Keep the intensity low enough to avoid burning the screen, keep magnets and steel tools away from the tube, and switch off and wait before touching any connection, as the CRT supply is high voltage.
What to Specify When Ordering
- Quantity — the minimum order is 10 units, usually one kit per student group.
- Solenoid data — the listing does not give the turns or coil size of the ring solenoid, so ask for the values your calculation needs.
- Mains supply — state the voltage and plug type of your lab so the quotation can confirm them.
- Companion apparatus — add Millikan’s oil drop apparatus or another e/m method if your syllabus covers more than one.
Frequently Asked Questions
What does the magnetic focusing method measure?
The specific charge of the electron, e/m. The solenoid’s field focuses the spread-out beam to a spot at one value of current, and that current, the acceleration voltage and the tube geometry give the result.
Which controls and meters does the power supply have?
Controls for intensity, focus, X and Y deflection and solenoid current, and two meters — one for the acceleration voltage and one for the solenoid current. The listed dimensions are 11 x 7 x 4 inches.
What size is the CRT and how is it mounted?
It is a 3-inch CRT mounted on a teak wood stand, with the ring-type solenoid sliding over the tube.
How is the solenoid fitted to the tube?
It is a ring-type solenoid that slides over the CRT, so it sits around the tube on the teak wood stand; set its position as your practical manual directs before taking readings.
What is the minimum order and dispatch time?
The minimum order is 10 units, sold individually, and dispatch is usually within 7–10 working days. Each kit is visually inspected at the works, and export transit time depends on the destination and shipping method.
What should an export enquiry contain?
The quantity, the destination country and port or city, preferred delivery terms such as FOB or CIF, any packing or labelling instructions, and a tender reference if applicable.
Who manufactures this kit?
Jain Laboratory Instruments Pvt Ltd, trading as JLab, at its works in Ambala, Haryana, India; quotations come directly from the manufacturer.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a maker of physics and electronic lab instruments in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The supply unit, teak wood stand and ring solenoid of this kit are made at JLab’s own works rather than sourced from traders, so universities, colleges, dealers and importers receive it factory-direct, every kit is visually inspected before dispatch, and repeat orders and spare parts are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — for example Chile in South America, Bangladesh in South Asia, Madagascar in East Africa, Botswana in Southern Africa and Tonga in Oceania. For tender purchases, see the JLab lab tenders page.
Related Electron Beam Apparatus
- e and m by Helical Method Solenoid Method — the same focusing principle with the CRT inside a multi-layer solenoid.
- e and m By Thomson Bar Magnet Method — e/m by balancing electric and magnetic deflections of a CRT beam.
- e and m by Short Solenoid Method Magnetron Method — e/m from magnetron cut-off in a solenoid.
- Millikan’s Oil Drop Apparatus — measures the charge on the electron.
- Demonstration Cathode Ray Oscilloscope CRO — a basic CRO model for teaching how each section of an oscilloscope works.
See all units in the E M Apparatus range or the wider Scientific Instrument range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), your mains voltage, any solenoid data you need and the delivery location through the contact page.
Last updated: 9 October 2026
