Lab 4P - Physics Lab Lab 3 e/m of the electron Aleksey...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Physics Lab Lab 3 e/m of the electron Aleksey Zelenberg Introduction This experiment indirectly measured the charge to mass ratio of an electron (e/m), one of the basic physical constants in nature along with the magnetic field of the earth. Our results indicate an e/m ratio of 1.91108*10 11 .00161*10 11 C/kg. For the preliminary part of the experiment, we obtained a B E value of 3.92*10-5 1.96*10-5 T. For the main part of the experiment, we obtained a B E value of 1.416*10-5 0.513*10-6 T. The value we obtained for e/m is on the correct order of magnitude with the accepted value of 1.758*10 11 C/kg. However, even within the statistical error range, this accepted value does not correspond to our obtained ratio. Our value of B E , both from preliminary part of the experiment, and the value obtained from graphical intercepts, also does not correspond with the accepted value of 5*10-5 T. Procedure The procedure in this experiment is fairly straightforward. There is a direct correlation between the current in the Helmholtz coils and the inverse of the radius of curvature given by the following equation: By taking measurements of the various currents needed to produce given radii at particular voltages, it is possible to determine both e/m and B E with graphical methods. After noting the dip angle (an angle that is used to find the true value of the earths magnetic field), we obtained a preliminary measurement of B E...
View Full Document

This note was uploaded on 04/08/2008 for the course PHYSICS 1494 taught by Professor Cambareri during the Spring '08 term at Columbia.

Page1 / 4

Lab 4P - Physics Lab Lab 3 e/m of the electron Aleksey...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online