Experiment 1: Mapping Electric PotentialsIn this experiment, you will create an electric field and use a multimeter to detect and draw equipotential lines.Procedure1. Prepare the digital multimeter by inserting theblack cord in the “COM” port and the red cordin the “VΩmA” port. 2. Turn the dial until the arrow points to the “20”in the “DCV” section located in the top lefcorner of the multimeter (Figure 6). Do notturn the multimeter on. 3. Print out Figures 7, 8 and 9. If you are usingthe procedure from the lab manual pdf, usescissors to carefully cut and separate Figure 7from 8. 4. Set the printout with the circles on the table in front of you. Place the printout with two rectangles aside for later use. The printout with the circles and rectangles will be used for analysis. 5. Open and lay the Petri dish over the field map in Figure 7a. 6. Roll two identical balls of Play-Doh© with approximately the same diameter of the circles on the field map. 7. Stick the two Play-Doh© balls inside the Petri dish over the two circles. Ensure that they are stuck to the dish. 8. Use the ruler and scissors to measure and cut two 5 x 5 cm squares from the aluminum foil. © 2014 eScience Labs, LLC.All Rights Reserved MaterialsAluminum Foil 2 Alligator Clips2 AA BatteriesAA Battery Holder(1) 250 mL BeakerDigital MultimeterField Map Printouts(1) 9 cm Petri DishPlay-Doh© Ruler Scissors1 Transfer Pipette*2 Different Colored Writing Utensils*Printer*2 Printer Paper Sheets*Water*Willing Participant (Optional)*You Must ProvideFigure 6: Multimeter set up.9. Starting at one side of the foil square, roll (or fold) the foil into a rod. Be sure to make the rod as compact as possible. It may be easiest to achieve this by squeezing the rod between your fingers afer you have rolled it to get it firmly packed. 10. Stick the aluminum rods into the Play-Doh© so they stand up vertically and are inserted as far as possible into the Play-Doh©. 11. Fill a 250 mL beaker with 50 mL of tap water from the sink. For best results, do not use purified water. 12. Use the transfer pipette to fill in a THIN LAYER of water in the base of the Petri dish. 13. Loosen up the alligator clip wires by stretching and bending them. 14. Connect one end of an alligator clip to the positive side of the battery holder and the other end to the aluminum foil rod on the lef circle. 15. Connect a second alligator clip end to the negative side of the battery holder and the other end of the alligator clip to the aluminum foil rod on right circle.Note: Be careful that the alligator clips do not pull the aluminum foil out of the Play-Doh© or cause them to stick out the sides. 16. The system is now set up and you will start mapping the electric potential at different points in the Petri dish using the digital multimeter. 17. Turn the multimeter on using the switch under the dial. 18. Put the black probe in contact with the right sphere and the red probe in contact withthe lef sphere. Observe the reading on the multimeter. 19. Divide the observed reading by six to obtain six even increments. For example, if the observed reading between the two spheres is 2 V, then 0.33, 0.66, 0.99, 1.33, 1.66 and 2 V would be the six equipotential lines you would look for. 20. Find the six equipotentials calculated from Step 19 by holding the black probe on the right sphere and moving the red probe around the field map. 21. Afer an equipotential has been found, mark its location on the field map in Figure 7b.Note: 1. When you are getting ready to mark an equipotential location set the black probe down to mark the location of the red probe. Afer the location has been marked, replace the black probe and find the next equipotential. 2. If you have a partner, use scissors to separate the field map in Figure 4b and have them mark the locations of your equipotential. 22. Once you have found all of the equipotential locations, clean up the Petri dish by removing the clay, water and foil. 23. Repeat Steps 5 - 19 for the field maps in Figure 8. © 2014 eScience Labs, LLC.All Rights ReservedFigure 7: Equipotential mapping areas for Step 5 (left) and Step 21 (right).Figure 8: Equipotential mapping areas for Step 23.© 2014 eScience Labs, LLC.All Rights ReservedFigure 9: Equipotential mapping areas for Post-Lab Questions 1 and 2.Post-Lab Questions1. Use the data collected to draw your equipotential lines on Figures 9a and 9b. Label what potential each equipotential line represents.2. Add electric field lines to the Figure 9 field maps. Don’t forget that electric fields are vectors and need to have a direction!Hint: Use a different colored writing utensil to help make the distinction between the equipotential lines and the electric field lines.3. Did your predictions match with your data analysis? Use your results to support your answer.© 2014 eScience Labs, LLC.All Rights ReservedTitle© 2014 eScience Labs, LLC.All Rights ReservedMapping Electric FieldsAbstractElectric field maps can be produced by mapping an electric field’s equipotential lines, and then connecting them with electric field lines. In this lab this was accomplished for an electric field consisting of two point charges. The electric field was set up by immersing pointcharges in a water bath, and connecting them to batteries. Using a multi-meter the equipotential lines were determined. After connecting these lines perpendicularly with the electric field lines an electric field map was produced. This map clearly showed an electric field that curved as it traveled between the charges. The lab taught many concepts relating to the study of electric fields.IntroductionIn physics an electric field exists around all charged objects. This field cannot be seen by the naked eye, but we can see the electric field if we create a map of the electric field. In the map of an electric field the field is shown through lines, called electric field lines, connecting the charged points. These lines run from a source of positive electric charge to a source of negative electric charge, and are perpendicular to the lines of equipotential. The lines show how a test charge would move in the electric field. This is why the lines run from positive to negative, because a test charge is positive and will be repealed by the positive source of charge, but attracted by the negative source of charge. The drawing of multiple of these electric field lines creates an electric field map.© 2014 eScience Labs,