Lab E6 - McGee 1 Lab E6 Determination of "e/m"...

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McGee 1 Lab E6 Determination of “e/m” for the electron Allison McGee Mr. Fedorchak Thursday 2:00- 4:50pm Partners: Stevie Whitehead Trey Smith
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McGee 2 Abstract : The purpose of this lab was to measure the ratio of an electron’s charge to its mass using the Lorentz Force. We observed an average e/m value of 1.918 x 10 11 C/kg, compared to the accepted value of 1.7588 x 10 11 C/kg. This yielded a percent discrepancy of 9%. Introduction : Towards the end of the 19 th century, J.J. Thomson studied the cathode rays extensively, finding that the rays were particle-like in nature. He also discovered that the ratio of these particles’ charge to mass was the same no matter what gas was in the tube. Thomson is credited with the proof of the existence of the electron. By using the equation below, it is possible to solve for the e/m ratio: e/m= 2V/(B2r2) This equation comes from manipulating the Lorentz force equation and setting it equal to the centripetal force equation and combining it with the equation for conservation of
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This note was uploaded on 05/05/2008 for the course PHYS 222 taught by Professor Fedorchak during the Fall '08 term at Campbell.

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Lab E6 - McGee 1 Lab E6 Determination of "e/m"...

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