e-m Ratio Report

# e-m Ratio Report - I 1 and D were not taken into...

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Date:_____________ Phys211L/Phys205L Charge-to-Mass Ratio of an Electron Names: ______________________Section number: ________________ Instructor:__________________ Number of turns in a coil: D d I 1 (A) Average diameter of the Helmholtz coils: ± (m) Average separation of the coils: ± (m) Average value of I 1 = ± (A) Accelerating voltage: ± (V) R(m) I 2 ( ) I ( ) 1/R ( y ) B ( x ) B 2 (x 2 ) B/R (xy) e=Ax i +B-y i e 2 0.0325 0.0390 0.0450 0.0515 0.0575 Sums Plot 1/R vs. B and calculate, using linear regression, the slope α of the line. Determine from the slope the value of e/m with its associated error.

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Compare your value of e/m to the literature value. Comment. In your determination of e/m, the errors on d,

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Unformatted text preview: I 1 and D were not taken into consideration. How would these errors contribute to your final results? Looking down at the coils, their magnetic field is (out of) o r ( into) the coils. Check one. Use the value of I 1 to calculate the Earth’s magnetic field. Compare it to the literature value that may be obtained from the Internet or physics handbooks. What is the direction of the Earth’s magnetic field; into the floor or out of the floor? Why is it imperative to keep the tilt angle and the direction of the coils fixed during the experiment? 4...
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