124-05 Measurement of the charge_mass ratio for electrons

124-05 Measurement of the charge_mass ratio for electrons -...

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Physics 124 - Experiment NO PHYSICS 124 EXPERIMENT NO. 5 MEASUREMENT OF THE CHARGE/MASS RATIO FOR ELECTRIONS Measuring e/m 1. If you will be working in a lighted room, place the hood over the e/m apparatus. 2. Flip the toggle switch up to the e/m MEASURE position. 3. Turn the current adjust knob for the Helmholtz coils to the OFF position. 4. Connect your power supplies and meters to the front panel of the e/m apparatus, as shown in figure 4. 5. Adjust the power supplies to the following levels: CAUTION: The voltage to the heater of the electron gun should NEVER exceed 6.3 volts. Higher voltages will burn out the filament and destroy the e/m tube. ELECTRON GUN HEATER: 6.3 VAC OR VDC ELECTRODES: 150 to 300 VDC HELMHOLTZ COILS 6-9 VDC 6. Slowly turn the current adjust knob for the Helmholtz coils clockwise. Watch the ammeter and take care that the current does not exceed 2 A. 7. Wait several minutes for the cathode to heat up. When it does, you will file:///C|/WINDOWS/Desktop/Lab%20Manual/124/HT. ..the%20charge_mass%20taio%20for%20electrons.htm (1 of 4) [8/15/01 10:19:24 AM]
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124-05 Measurement of the charge_mass ratio for electrons -...

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