formal lab

formal lab - Nick Voelz Phys 4 TA: Kevin Hand 03-13-2008...

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Nick Voelz Phys 4 TA: Kevin Hand 03-13-2008 Electron Deflection Lab A. Beginning Ideas and Questions The overall idea that this lab was intended to teach us was how different fields with varying strengths can alter the path of an electron as it travels through a vacuum. The vacuum in this case is a cathode ray tube, which sends a beam of electrons down the center of the tube in a straight path. The path remains straight unless acted on by an outside force. All in all, this lab introduces us to how varying field forces can change the path of the electron beam. B. Tests and Procedures First of all we began by testing the vertical deflection of the electron beam, to do this we varied the voltage through the two horizontal plates in the cathode tube, the impending electric field deflected the electron beam vertically in either direction based on the voltage passing through the two plates. The deflection and corresponding voltage were both recorded for later analysis. The same procedure was also used for testing the horizontal deflection due to the electric field between the horizontal plates within the cathode ray tube. Following those two test we tested how an external magnetic field can alter the path of the electron beam within the vacuum. To test this we used two 3400 turn solenoids to induce a magnetic field on both sides of the CRT. This caused either a positive or negative vertical deflection. This deflection and corresponding voltage was recorded for later analysis. Lastly, we tested for Lorenz forces, and their effects on the beams path. To do this we set the voltage passing through the solenoids and recorded the voltage, and then we varied the voltage between the two horizontal plates in the ray tube so that the beam was brought back to the origin. This result gave us the corresponding voltage of the electric field that counter- acted the magnetic field induced by the solenoids. C. Results and Observations This section outlines the experiment date recorded as well as the corresponding graphs of the data. Vertical Deflection y = 0.1062x - 0.2571 R 2 = 0.9971 y = 0.0867x - 0.2437 R 2 = 0.9911 -1.5 -1 -0.5 0 0.5 1 1.5 2 -20 -10 0 10 20 30 Voltage Displacement (cm) Vertical Deflection 1 Vertical Deflection 2 Linear (Vertical Deflection 2) Linear (Vertical Deflection 1) Horizontal Deflection y = -0.0834x + 0.0051 R 2 = 0.9979 y = -0.0654x + 0.1048 R 2 = 0.9968 -2 -1.5 -1 -0.5 0 0.5 1 1.5 -20 -10 0 10 20 30 Voltage (Volts) Deflection (cm) Horizontal Deflection 1 Horizontal Deflection 2 Linear (Horizontal Deflection 1) Linear (Horizontal Deflection 2)
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Chart Title y = 1.0317x + 0.0394 R 2 = 0.9974 -1.5 -1 -0.5 0 0.5 1 1.5 -1.5 -1 -0.5 0 0.5 1 1.5 V ol t age ( V ol t s) Magnetic Deflection Linear (Magnetic Deflection) Trial 1(Lorenz) TrialVoltage C Voltage B Voltage M Deflection(Squares) Voltage to Bring BackDisplacement (cm) 1 125 255 0.28 1 -3.05 0.26 2 125 255 0.51 2 -6.2 0.52 3 125 255 0.71 3 -9.61 0.78 4 125 255 0.99 4 -13.34 1.04 5 125 255 1.15 5 -16.38 1.3 6 125 255 -0.27 -1 5.16 -0.26
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This note was uploaded on 04/29/2008 for the course PHYS 4 taught by Professor Collins during the Spring '08 term at Marquette.

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formal lab - Nick Voelz Phys 4 TA: Kevin Hand 03-13-2008...

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