Current		Accelerating Voltage	Left side (cm)	Right Side (cm)
1.51	Student 1	150	3.8	3.25
		171	4	3.5
		190	4.2	3.8
		210	4.3	4
		230	4.5	4
		250	4.75	4.25
	Student 2	151	4.75	3.25
		170	3.9	3.5
		190	4.1	3.75
		210	4.3	4
		230	4.5	4
		251	4.75	4.25
	Student 3	150	3.75	3.25
		170	4	3.5
		190	4.15	3.7
		210	4.3	3.9
		230	4.5	4
		250	4.75	4.25

Measurements of radius by student 1
Voltage (V)	Left Radius (m)	Right Radius (m)
150.00	0.05	0.04
170.00	0.05	0.05
190.00	0.05	0.05
210.00	0.06	0.05
230.00	0.06	0.05
250.00	0.06	0.06
Current for B field: 1.50 A
Measurements of radius by student 2
Voltage (V)	Left Radius (m)	Right Radius (m)
150	0.045	0.040
170	0.045	0.045
190	0.0475	0.050
210	0.055	0.055
230	0.0575	0.060
250	0.060	0.0625

Magnetic field current: I = 1.49 A
Measurements by student 1
Accelerating voltage (V)	Radius of electron beam-side 1 (m)	Radius of electron beam-side 2 (m)
150	0.04	0.022
170	0.045	0.035
190	0.047	0.036
210	0.048	0.04
230	0.051	0.042
250	0.054	0.045
Measurements by student 2
Accelerating voltage (V)	Radius of electron beam-side 1 (m)	Radius of electron beam-side 2 (m)
150	0.042	0.024
170	0.044	0.035
190	0.045	0.04
210	0.046	0.043
230	0.047	0.05
250	0.05	0.051
Measurements by student 3
Accelerating voltage (V)	Radius of electron beam-side 1 (m)	Radius of electron beam-side 2 (m)
150	0.043	0.025
170	0.044	0.035
190	0.047	0.036
210	0.049	0.038
230	0.05	0.039
250	0.052	0.041

Electron Charge-to-Mass Ratio Results

Procedure and Analysis

1. The radius of the electron beam was measured and the data have been provided.

2. Use the equation provided above to determine the magnetic field.

3. Use equation 3 to find e/m for each case.

4. Determine the standard deviation for your data. Discuss the precision of your experiment. Are the individual measurements with associated uncertainty accurate when compared to the accepted value?

5. Find the average value and standard deviation of your measurements of e/m. Compare the average with the accepted value of 1.76x1011C/kg. Was your average value accurate?