181L_Lab_10-1

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

• Notes
• 3
• 100% (1) 1 out of 1 people found this document helpful

This preview shows pages 2–3. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

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)
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern