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To determine e/m of an electron experimentally
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Tare-sang Nam Physics 102 11/26/02 Physics Lab Determination of e/m of an Electron 1. Purpose To determine e/m of an electron experimentally 2. Procedure Prepare an electron-accelerator. Place it between Helmholts Coils, which produces a uniform magnetic field. The electron-accelerator creates a potential difference, v, which speeds up a negatively charged electron to . This moving charge experiences a force while it is traveling through a magnetic field; especially, when it travels through a uniform magnetic field with its velocity vector perpendicular to the field, the moving electrons experience centripetal force. It causes the circular motion of the moving electrons. Observe this phenomenon, and record the voltage applied to the accelerator and the radius of the circle along which these electrons are moving. 3. Data R (m) R2 (m2) V (volt) 0.050 0.0025 121 0.055 0.0030 139 0.059 0.0034 161 0.062 0.0039 182 0.057 0.0032 150 0.053 0.0028 129 0.060 0.0036 170 4. Mathematical Formulas and Equations where v = the voltage that accelerates electrons a = the radius of the coils N = the number of turns on each coil µ...
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