1. Calculate the theoretical value of e/m using the known values of the electric
ID: 1551436 • Letter: 1
Question
1. Calculate the theoretical value of e/m using the known values of the electric charge and electron mass (which you can look up in a textbook).
2. Some coils have a radius of R = 10.65 cm and N = 125 turns. If the current is 4.3 A, what is the magnetic field B, in Tesla, from equation 7?
3. Using the magnetic field in problem 2, if the accelerating voltage is 93 V, and the radius of the electron orbit is .75 cm, what is e/m from equation 5?
4. Calculate the percent error between your result for problem 3 and the theoretical value of e/m.
Equation 5:
Equation 7:
Combining with equation (1) gives 2V m Ber (5)Explanation / Answer
1. e/m=1.6*10-19 /9.1*10-31 = 1.7582*1011 Coulomb/Kg
2. (0.7155*1.25*10^(-6)*125*4.3)/0.1065 = 0.0045 Tesla
3. e/m=(2*93)/((ans^2)*(0.0075)^2)= 1.0696*10-16 C/kg
4 percent error=(1.7582*1011 -1.0696*10-16 )/1.7582*1011 *100=100 % error
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