lab2 6 - Winter Quar ter 2009 0/35 Specific Charge of an...

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0 /35 Winter Quarter 2009 Winter Quarter 2009 Experiment: Specific Charge of an Electron Your name: Cory Poynter Partner: Performed on: 3/17/2009 TA: Section number: Promptness % (100 means it was on time): 100 Additional Scores (+) /Penalties (-): Please insert your material in the space between or after the red or yellow boxes, not in the boxes themselves. Abstract (4) The purpose of this experiment was to observe how a magnetic field affects a moving charge and to find the charge to mass ratio of an electron. First turn on the instrument and it will go through a warm up and internal check lasting thirty seconds before you can use it. Next double check the dip needle to make sure that the coils are properly aligned and whether the tube axis is perpendicular to the N-S direction. Afterward use the tape measure to find the diameter d coil of one of the Helmholtz coils by measuring from the center of the bundle of wires and assume an uncertainty of 0.5 cm. Then choose two coil currents between 1.50 A and 2.00 A that are at least 0.25 A apart and are different from the group you are sharing the apparatus with. Next be sure the blackout cloth is draped over the coils. Then continue increasing the voltage until the electron beam hits the 5 cm mark on the glass rod going through the center of the bulb and record the current I , the path diameter d orbit and the voltage V . Repeat the previous step for path diameters of each half centimeter up to and including 11 cm. ( d orbit (cm) = 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0) and then return the voltage to zero. Next the previous two steps are to be repeated for the second coil current to no higher than 500V. Finally estimate and record uncertainties in I , d orbit , and V . and turn off the apparatus. The following data is the data I obtained from the experiment:
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6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 H V (volts) 100 106 114 131 150 171 194 221 253 272 297 315 334 100 113 137 162 179 207 236 267 301 327 362 398 431 462 1 2 3 4 A B C D E F G H μ 0 (T·m/A)= 1.256E-06 u{d orbit } (cm)= 0.3 u{V} (volts)= 2 N= 130 u{I} (A)= 0.01
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This note was uploaded on 07/13/2011 for the course PHYS 212 taught by Professor Adams during the Winter '08 term at Alabama.

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lab2 6 - Winter Quar ter 2009 0/35 Specific Charge of an...

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