LAB 212

# LAB 212 - LAB 212 Mehar Ghei LABORATORY EXPERIMENT REPORT...

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LAB 212 Mehar Ghei LABORATORY EXPERIMENT REPORT Name: Mehar Ghei Group Members: Yvonne Chen, Marvin Castellon, Jeremy Buhain Experiment Date: Thursday, March 31 st Course Name: PHYS 121A Section: H02 Instructor: Beidi He LABORATORY #212 Measurement of e/m for an Electron 1. OBJECTIVE To measure the charge to mass ratio of e/m for an electron. 2. THEORETICAL BACKGROUND = eV 12mv2 = em v22V 3. EQUIPMENT a. Electron e/m deflection tube b. Pair of Helmholtz coil c. Ammeter d. Magnetic compass e. L.T Power Unit f. KV Power Unit g. Wires 4. COLLECTED DATA Step I V=6.1V I=1.5A Step II kV=3 V= 6.1V I=0.5A X (value)*10 -2 *cos(15) 2 2.8 3 4 5 6 Page 1 of 3

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LAB 212 Mehar Ghei Y (value)*10 -2 0.4 0.6 0.7 1.1 1.7 2.4 Xexp=[2 2.8 3 4 5 6]*10^-2*cosd(15); Yexp=[0.4 0.6 0.7 1.1 1.7 2.4]*10^-2; e=1.6*10^-19; me=9.11*10^-31; N=320; R=6.8*10^-2; I=0.5; d=5.2*10^-2; Vp=3*10^3; B=8.992*10^-7*N*I/R; E=0.77*Vp/d; v=E/B; v x=0:0.002:0.1;y=-0.4:0.005:0.4; r=5.6504888888*10^-2; x=sqrt(2*y.*r-y.^2); plot(x,y,x,-y,Xexp,Yexp,
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LAB 212 - LAB 212 Mehar Ghei LABORATORY EXPERIMENT REPORT...

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