Advanced Physics Project

5

Hi, I’m doing my physics project on various constants in electromagnetism and my first experiment is on charge to mass ratio of an electron, anyone have any tips on my theory/underlying physics for this? Not sure what my references should be yet and I can’t find much good research online.

Reply 1

Nitrotoluene

11

Original post

by emmalkyle

Hi, I’m doing my physics project on various constants in electromagnetism and my first experiment is on charge to mass ratio of an electron, anyone have any tips on my theory/underlying physics for this? Not sure what my references should be yet and I can’t find much good research online.

We really work out the electron charge-to-mass ration Q/m in two ways based on the circular motion caused by Lorentz force:
1. Helmholtz Coils: By using that device, coils generate a uniform magnetic field, thus electrons movement in a circle is visible. The charge-to-mass ratio can be obtained if one measures the size of the circle and the speed of the electrons.
2. Thomson's Way: In this method, electric and magnetic forces are balanced so that the electron beam is straight. One field is then removed. The beam will curve, and from that curve, the charge-to-mass ratio can be calculated.
Refer to points 1 and 2 in your textbooks for a better understanding of the calculation.

Cioa,
Sandro

(edited 1 month ago)

Reply 2

Eimmanuel

Study Forum Helper

15

Original post

by emmalkyle

Hi, I’m doing my physics project on various constants in electromagnetism and my first experiment is on charge to mass ratio of an electron, anyone have any tips on my theory/underlying physics for this? Not sure what my references should be yet and I can’t find much good research online.

A good place to start is using google or wikipedia

https://en.wikipedia.org/wiki/List_of_physical_constants
https://physics.nist.gov/cuu/Constants/histindex.html

https://www.nist.gov/pml/fundamental-physical-constants
The above website has all the accurate physical constants to date.

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