E M Apparatus Manufacturer, Suppliers and Exporter in India
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Last updated: 22 October 2026
Quick Answer
E M Apparatus covers the electron experiments of modern physics practicals: four set-ups that measure the specific charge of the electron, e/m, by the Thomson bar magnet, helical, short solenoid (magnetron) and magnetic focusing methods, and the Millikan oil drop apparatus for the charge on the electron. The e/m set-ups each include a tube, a power supply and meters. JLab currently lists 5 items in this category.
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Explore the E M Apparatus Range
| Range | Items | What it covers |
|---|---|---|
| e/m of the Electron Apparatus | 4 | Thomson bar magnet set-up with an 800 V DC EHT supply and deflecting magnetometer, helical method with a multi-turn standard solenoid, short solenoid magnetron method, and magnetic focusing with a 3-inch CRT. |
| Millikan Oil Drop Apparatus | 1 | Condenser, light source and measuring microscope with micrometer scale on a cast iron base and steel pillar, with an atomizer on the same carriage. |
E M Apparatus Specifications
Each row gives the experiment and the tube, solenoid, supply or microscope parts stated on that set-up's own page.
e/m of the Electron Apparatus (4)
| Product | Specification |
|---|---|
| e and m By Thomson Bar Magnet Method | Experiment: To measure e/m of the electron by Thomson’s method (bar magnet method); EHT supply: 800 V DC, for the cathode voltage of the cathode ray tube; Deflecting supply: 0–100 V DC, applied to either the Y1 or the Y2 plates. |
| e and m by Helical Method Solenoid Method | Experiment: To measure e/m of the electron by the helical method; Solenoid: Standard solenoid of multi-turn layers, fitted on a wooden base; Voltmeter: High-resistance voltmeter provided. |
| e and m by Short Solenoid Method Magnetron Method | Experiment: To study the charge of an electron (e/m) by the short solenoid method; Meters: Two: anode voltage and solenoid current; Power supply dimensions: 13 x 7 x 7 in (about 33 x 18 x 18 cm). |
| e and m by Magnetic Focusing Method | Experiment: To study the charge of an electron (e/m) by the magnetic focusing method; Cathode ray tube: One 3-inch CRT mounted on a teak wood stand; Solenoid: Ring-type solenoid that slides over the CRT. |
Millikan Oil Drop Apparatus (1)
| Product | Specification |
|---|---|
| Millikan's Oil Drop Apparatus | Experiment: Measuring the charge on the electron by Millikan’s oil drop method; Principal elements: Specially designed condenser, light source and measuring microscope, all mounted on a common support; Support: Heavy cast iron base with a steel pillar carrying the microscope and the lamp house. |
Who Buys This Range
Physics departments of colleges and universities running the e/m experiment with the Thomson bar magnet, helical, magnetron or magnetic focusing set-up, and the electron-charge experiment with the Millikan oil drop apparatus and its measuring microscope.
Frequently Asked Questions
Which methods for measuring e/m does this range cover?
Four: the Thomson bar magnet method with an 800 V DC EHT supply and a deflecting magnetometer, the helical method with a multi-turn standard solenoid, the short solenoid (magnetron) method, and the magnetic focusing method with a 3-inch CRT inside a ring-type solenoid.
What does the Millikan oil drop apparatus include?
A specially designed condenser, a light source and a measuring microscope with a micrometer scale, all on a heavy cast iron base with a steel pillar, slow-motion screws for horizontal and vertical movement of the microscope, and an atomizer fitted on the same carriage.
Request a Quote
Give the method and the number of set-ups, for example the e and m by Magnetic Focusing Method or the Millikan's Oil Drop Apparatus, and write to us through the contact page.
e and m by Helical Method Solenoid Method
Product Code : EL-EMA-1066
Having three major parts to measure electron for e/m by Helical Method, i.e. Standard Solenoid of multi-turned layers fitted on wooden base.
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