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# To determine e/m of an electron experimentally

Extracts from this document...

Introduction

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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 .

Middle

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 = 4π*10-7

I = the current through the coils

Conclusion

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