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Experiment 4: Charge to mass ratio (e/m) of the electron
www.columbia.eduPHYS 1493/1494/2699: Exp. 4 – e/m of the electron 2 Introduction Our first measurement of atomic structure Charge-to-mass ratio of electron: Motivation and history of the first e/m measurement Consequences Thomson’s experiment The physics behind the experiment: The magnetic field generated by a single loop Charged particle in constant magnetic field
Measurement of Charge-to-Mass (e/m) Ratio for the Electron
ixnovi.people.wm.eduThe accepted value for the charge-to-mass ration of the electron is e=m = 1:7588196¢1011 C/kg. Experimental Procedure Equipment needed: Pasco e=m apparatus (SE-9638), Pasco High Voltage Power supply (for the acceler-ating voltage and the fllament heater), GW power supply (for the Helmholtz coils), two digital multimeters.