User:Jacob R Jaramillo/Notebook/E/M

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Safety

SJK Incomplete Feedback Notice
Incomplete Feedback NoticeMy feedback is incomplete on this page for two reasons.  First, the value of the feedback to the students is low, given that the course is over.  Second, I'm running out of time to finish grading!
Incomplete Feedback Notice
My feedback is incomplete on this page for two reasons. First, the value of the feedback to the students is low, given that the course is over. Second, I'm running out of time to finish grading!
SJK 22:32, 19 December 2009 (EST)
22:32, 19 December 2009 (EST)Nice graphs and spreadsheets (which at this point I didn't have time to look over.  But a bit sparse on the notes and the summary, which made it difficult to follow your conclusions.
22:32, 19 December 2009 (EST)
Nice graphs and spreadsheets (which at this point I didn't have time to look over. But a bit sparse on the notes and the summary, which made it difficult to follow your conclusions.
  • As always when dealing with electricity, be care not to touch any exposed metal on the banana clips when plugging in connections and when removing connections.
  • Use caution when handling the bulb as not only is it an expensive piece of equipment, it can shatter and cut you.
  • Be careful not to exceed the maximum voltage load of 6.3 volts to the heater.

Equipment

  • HP DC Power Supply, Model 6384A
  • SOAR DC Power Supply, Model 7403
  • Gelman Power Supply
  • BK Precision Digital Multimeter, Model 2831B
  • e/m Experimental Apparatus, Model TG-13


Procedure

The following experiment was conducted via Professor Gold's manual

A summary of the procedure is:

  • Connect 6-9V DC supply at 2A to the Helmholtz coil jacks
  • Connect ammeter in series to measure current
  • Connect 6.3 volts (do NOT exceed 6.3 volts) rated at 1.5A to the heater jacks
  • Lastly connect HV source (150-300V DC) rated at 40mA to the electrode jacks of the electron gun.

Results

View/Edit Spreadsheet

Image:R2vsV.jpg


1/R vs Current

View/Edit Spreadsheet

Image:1_RvsCurrent.jpg


Conclusions

SJK 22:31, 19 December 2009 (EST)
22:31, 19 December 2009 (EST)I'm not sure what you mean by "error" whether it's uncertainty (random error) or discrepancy from the accepted value.  I thought you were talking about discrepancy, in which case, it looks like above you have much more than 5% (as everyone does with this lab.
22:31, 19 December 2009 (EST)
I'm not sure what you mean by "error" whether it's uncertainty (random error) or discrepancy from the accepted value. I thought you were talking about discrepancy, in which case, it looks like above you have much more than 5% (as everyone does with this lab.

Although my error wasn't extremely significant, some reasons for error that I came up with are:

  • Reading the actual radius with the naked eye
  • The gas ratio in the tube
  • Sensitivity of the voltage and current meters

Summary

E/M Summary

Notes

  • Place some notes here for visitors
  • Example: This project is currently on hold until further notice.


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