Thomson's experiment: specific charge e/m of the electron
Deflect an electron beam with crossed E and B fields; balance them and get v = E/B and e/m = E^2/(2VB^2).
About this experiment
| Subject | Physics |
|---|---|
| Class | 12 |
| Chapter | 11. Dual Nature of Radiation and Matter |
| NCERT section | 11.2 |
| Level | NEET level |
| Time | about 14 minutes |
| Access | Included in a PractiSci plan |
What you do in the lab
Change the controls and watch the physics behave in real time in 3D. Live readouts and graphs show the numbers behind it, and the Learn tab has the theory, procedure, observations and viva questions. Works on a phone or a laptop, in English and Hindi.
Topics: Thomson · e/m · cathode rays · crossed fields
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- Heisenberg uncertainty principle with single-slit electron diffraction
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