Electron Physics Lab
Introduction
The purpose of this lab is to examine the motion of an electron, when it encounters a constant magnetic and electric field. We will also observe when the electric field and magnetic field will cancel each other out. This will lead to the electron having no net force acting upon it. By adjusting the values for the magnetic and electric fields, we will be able to check the different paths the electron follows. From this data we will be able to calculate the charge-to-mass ratio. Then, using the accepted value, we can calculate the percentage error.
This lab requires the use of two important pieces of equipment: the Helmholtz Coils and the deflection tube. The Helmholtz coils are used to generate the constant magnetic field. …show more content…
We will run a current through the Helmholtz coils to create a magnetic field. We will alter the values for the accelerating voltage (Va) and the current through the Helmholtz coils (Ib) and measure the radius of the trajectory. With our calculated values for e/m we will compare it to the accepted values.
Data and …show more content…
The more data points we use for these types of calculations the more accurate our data will turn out to be.
Based on our error analysis our final experimental value for the charge-to-mass ratio is: e/m = 1.54x10^11 +/- 1.618x10^10 C/kg
This seems to be fairly close to the accepted value of 1.7589*10^11 C/kg. However, the accepted value does not fit into our range. The discrepancy could have come from misreading of the x and y values from the mica sheet. It was sometimes hard to get exact values for the x and y. This could have been the reason for the difference between the accepted and observed values.
6.3.2 Electrostatic Deflection
Objective: The purpose of the lab was to create a potential difference between the deflection plates of the plates and measure various x and y values at fixed values of Va and Vd. With this data we will make a graph of y vs. x2 and then use this graph to calculate the value of the Electric field and find why and how the beam is deflected differently in compared to the magnetic field.
The purpose of this lab is to examine the motion of an electron, when it encounters a constant magnetic and electric field. We will also observe when the electric field and magnetic field will cancel each other out. This will lead to the electron having no net force acting upon it. By adjusting the values for the magnetic and electric fields, we will be able to check the different paths the electron follows. From this data we will be able to calculate the charge-to-mass ratio. Then, using the accepted value, we can calculate the percentage error.
This lab requires the use of two important pieces of equipment: the Helmholtz Coils and the deflection tube. The Helmholtz coils are used to generate the constant magnetic field. …show more content…
We will run a current through the Helmholtz coils to create a magnetic field. We will alter the values for the accelerating voltage (Va) and the current through the Helmholtz coils (Ib) and measure the radius of the trajectory. With our calculated values for e/m we will compare it to the accepted values.
Data and …show more content…
The more data points we use for these types of calculations the more accurate our data will turn out to be.
Based on our error analysis our final experimental value for the charge-to-mass ratio is: e/m = 1.54x10^11 +/- 1.618x10^10 C/kg
This seems to be fairly close to the accepted value of 1.7589*10^11 C/kg. However, the accepted value does not fit into our range. The discrepancy could have come from misreading of the x and y values from the mica sheet. It was sometimes hard to get exact values for the x and y. This could have been the reason for the difference between the accepted and observed values.
6.3.2 Electrostatic Deflection
Objective: The purpose of the lab was to create a potential difference between the deflection plates of the plates and measure various x and y values at fixed values of Va and Vd. With this data we will make a graph of y vs. x2 and then use this graph to calculate the value of the Electric field and find why and how the beam is deflected differently in compared to the magnetic field.