Equipment: EKG sensor EKG electrodes (3 for each person) LabPro computer interface Logger Pro software Excel program EM Field program Application 1: EKG Application 1.1 An electric quadrupole is a set of four charges, two positive and two negative, as in the diagram below. 2 -2 a. Use the EM filed program to plot the electric field and equipotential lines for an electric quadrupole b. It is also possible to us the EM field program to determine the potential difference between two points. In the EM field program, choose potential difference under field and potential on the tool bar. Click on one point, drag the cursor (while holding it down) to another point, and release. Choose any two points anywhere on the screen you want. The EM field program will give you the potential difference between the two points. c. If the charges were in motion, what do you expect would happen to the potential difference between those two points. Explain. d. Move the charges to a different position and check your prediction. Application 1.2 a. Your heart is like an electric quadrupole, with the charges constantly moving around. The electric field lines and the equipotential lines around your body due to your heart are constantly changing. It is possible to measure the electric potential difference between any two points on your body and see how it is changing. This is called an electrocardiogram (EKG or ECG). 45 intel We will measure your EKG. Obtain an EKG sensor, EKG electrodes, and a LabPro computer interface. Open the File EKG sensor. Follow the directions on page 5 of the EKG instructions for connecting the EKG sensors to a person. Record the EKG for one person in your group. (You can take an EKG for everyone in your group, if there is time.) Save your EKG to a file, so you can print it out b. You may want to read the details of how the heart works in the EKG sensor instructions. Summary. Summarize how you would use potential difference measurements to calculate the electric field at a point. Equipment: EKG sensor EKG electrodes (3 for each person) LabPro computer interface Logger Pro software Excel program EM Field program Application 1: EKG Application 1.1 An electric quadrupole is a set of four charges, two positive and two negative, as in the diagram below. 2 -2 a. Use the EM filed program to plot the electric field and equipotential lines for an electric quadrupole b. It is also possible to us the EM field program to determine the potential difference between two points. In the EM field program, choose potential difference under field and potential on the tool bar. Click on one point, drag the cursor (while holding it down) to another point, and release. Choose any two points anywhere on the screen you want. The EM field program will give you the potential difference between the two points. c. If the charges were in motion, what do you expect would happen to the potential difference between those two points. Explain. d. Move the charges to a different position and check your prediction. Application 1.2 a. Your heart is like an electric quadrupole, with the charges constantly moving around. The electric field lines and the equipotential lines around your body due to your heart are constantly changing. It is possible to measure the electric potential difference between any two points on your body and see how it is changing. This is called an electrocardiogram (EKG or ECG). 45 intel We will measure your EKG. Obtain an EKG sensor, EKG electrodes, and a LabPro computer interface. Open the File EKG sensor. Follow the directions on page 5 of the EKG instructions for connecting the EKG sensors to a person. Record the EKG for one person in your group. (You can take an EKG for everyone in your group, if there is time.) Save your EKG to a file, so you can print it out b. You may want to read the details of how the heart works in the EKG sensor instructions. Summary. Summarize how you would use potential difference measurements to calculate the electric field at a point
