Physics307L F09:People/Lancaster/Notebook/071022: Difference between revisions
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Latest revision as of 18:58, 6 August 2010
e/M lab
--Michael T. Lancaster 17:18, 22 October 2007 (CDT)
| Current (A) held constant | --Voltage (V)-- | r (cm) (left side)-- | r (cm) (right side)-- | r (cm) average |
|---|---|---|---|---|
| 1.52 | 296 | 5.5 | 6.5 | 6 |
| 311 | 5.5 | 7.1 | 6.3 | |
| 325 | 6.0 | 6.3 | 6.15 | |
| 340 | 6.0 | 7.3 | 6.65 | |
| 355 | 6.2 | 7.0 | 6.6 | |
| 370 | 5.8 | 7.2 | 6.5 | |
| 385 | 6.2 | 7.4 | 6.8 | |
| 400 | 6.3 | 7.5 | 6.9 | |
| 416 | 6.5 | 7.5 | 7 | |
| 430 | 6.5 | 7.5 | 7 | |
| 445 | 6.5 | 7.5 | 7 | |
| 454 | 6.5 | 7.8 | 7.15 |
| constant voltage | Current (ampheres) | r (right side) (cm) | r (left side) (cm) | r average (cm) | |
|---|---|---|---|---|---|
| 454 V | 2.25 | 7 | 6 | 6.5 | |
| 2.1 | 5.5 | 5 | 5.25 | ||
| 1.95 | 6.5 | 5.3 | 5.9 | ||
| 1.79 | 6.5 | 6 | 6.25 | ||
| 1.65 | 6.75 | 6 | 6.37 | ||
| 1.50 | 7 | 6.5 | 6.75 | ||
| 1.35 | 7.5 | 7 | 7.25 | ||
| 1.2 | 7.5 | 7.75 | 7.675 |
--Michael T. Lancaster 12:19, 19 November 2007 (CST)
Initial theory
F=qvB
ma = mv^2/r
qvB = mv^2/r
qB = mv/r
q/m = v/(rB)
Since both q (=e) and m (=mass of the electron) are constant then v/(rB) should be constant.
