PHY 132 - e_m of the Electron worksheet

1 E / M O F T H E E L E C T R O N – W O R K S H E E T Name:Arzu Hasanova Partners:Claire TA:Sang-Eon DATA & ANALYSIS Measuring the Radius of the Coil Diameter D x : .…12.4…………………… (unit: __inc___) Diameter D y : .……12.4……………… (unit: __inc___) D ave : ……12.4………………… (unit: __inc___) Radius of the coil : ……6.2.……………… (unit: __inc___) Part 1 - Measuring e/m (Constant Voltage) Accelerating Voltage V acc = ………200……. (unit: ___V__) Electron Orbit Radius r (in m) Coil Current I 0 (in A) Coil Current I 180 (in A) 0.055 1.05 0.95 0.050 1.18 1.08 0.045 1.29 1.21 0.040 1.45 1.38 0.035 1.65 1.57 0.030 1.86 1.83 Clean-up/sign-out (3): Data/Analysis (15/20): Graphs/Diagrams (20/10): Post Lab Q’s (20): Lab Report Total (88): Slope of B vs 1/r = _____4.24*10^-5 unit: T*m e/m from the slope = 2.22*10^11unit: Coulumbs/kg % error = 26.13% Calculations 2.22*10^11-1.76 × 10^11/1.76 × 10^11=26.13%

2 Part 2 - Measuring e/m (Constant Current) Coil Current ࠵? = ………1.3 (unit: _A_) Magnetic Field ࠵? = 0.0098 (unit: _Gauss____) Electron Orbit Radius r (m) Accelerating Voltage V 0 (in V) Accelerating Voltage V 180 (in V) 0.055 306 334 0.050 253 286 0.045 205 227 0.040 174 185 0.035 132 142 0.030 116 121 POST LAB QUESTIONS 1. Explain what you observed when you held the magnet close to the bulb. Did only the beam’s radius change, or did something else change, too? Why was the beam deflected in this way? The beam Calculations 2.2*10^11-1.76 × 1011/1.76 × 1011=25% Slope of ࠵? vs ࠵? ! = _______1.084*10^5___________ unit: V/m^2 e/m from the slope = ___2.2*10^11____________ unit: _C/kg____ % error = ________________25% Sketch the paths of the electron beam when you held the north & south ends of the magnet near the bulb. For each, show the position of the magnet relative to the beam and label the north & south poles. One of them is radius is increasing then magnetic field will be smaller and vice verse for other one. Also one is goes toward and one goes away

4 The spacecraft's magnetic shielding might be employed to deflect charged particles approaching it. Superconducting magnets could be used to make the shielding lightweight and affordable.