2 connect the 15v dc power supply to the coil power

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2. Connect the 15V DC power supply to the coil power supply terminals on the apparatus (P = + [red terminal] and K = - [black terminal]). With this type of power supply, adjust the knob of the coil power terminal entirely to its counter clockwise position and set the resistance to max. B] Observation and Experimentation a) For circular motion of the electron beam 1. Set the voltage of the “B power supply” to minimum, do the same for the coil power supply; then turn the filament power on (6.3V power supply). 2. Increase the “B power supply’s” voltage while observing the discharge tube’s electron beam, which should appear just below 200V. 3. Increase the voltage of the coil power supply to increase the intensity of the magnetic field; do so until a circular pattern appears. 4. If the electron beam traces a spiral path adjust the electron gun to its true perpendicular position by loosening the mounting screw of the discharge tube and adjusting its situation in the apparatus. b) Spiral motion (for fun) 1. Loosen the mounting screw and rotate the discharge tube’s position to change the shape of the electron path. c) --CAUTION—Do not raise the “B power supply” above 500V or the discharge tube will become damaged. C] Measurement 1. After proper set up of the apparatus has occurred, ensuring a minimization of earth’s magnetic field using a magnetic needle and aligning the device such that the coils are parallel to the needle, determine the charge to mass ratio [e/m] for the experiment. Data : Table 1 I = 2.0A V (Volts) r (m) r^2 (m^2) 150.00 0.024 0.00058 200.00 0.029 0.00083 250.00 0.032 0.00102 300.00 0.035 0.00123 350.00 0.038 0.00144 Table 2 V = 150V I^2 (Amp^2) r (m) 1/r^2 (m^- 2) 4.00 0.024 1736.1
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3.06 0.028 1322.3 2.25 0.032 976.6 1.56 0.038 692.5 1.00 0.047 452.7 Analysis/Report : 1)
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