NAME: Lab 1: Electric Charge, Electric Field and Electric potential In this lab you will use the Charges and Fields PhET lab to study the electric field and electric potential in the space surrounding one or more point charges. 1. The Electric Field and Electric Potential Created by a Dipole Click on the “Grid” button. Pick the +1nC and the -1nC point charges and place them on the grid 5 m away from each other. Verify the distance with the measuring tape. This is how your computer screen should look like: Consider a Cartesian xy coordinate system with the origin fixed on the positive point charge, the x axis horizontal the y axis vertical. A. Click on the “Electric Field” button: the electric field vector will be displayed on the screen. You can use the electric field sensor to measure the magnitude and direction of the electric field at different locations. Electric field sensor B. Calculate the magnitude and direction of the electric field at the following locations, then compare with values obtain from the simulation: Point E magnitude E direction E magnitude E direction calculated Calculated “Measured” “Measured” 1 Point A located midway between the charges 2 Point B located at (x=1m, y=1.5m) 3 Point C located at (x=4 m, y=1.5m) 1 With your phone take a picture of your calculations and insert it here to show your work. C. Calculate the electric potential at the same locations and compare with the values “measured” with the equipotential meter. Do not forget to include sign. Point V calculated 1 Point A located midway between the charges 2 Point B located at (x=1m, y=1.5m) 3 Point C located at (x=4 m, y=1.5m) V “Measured” With your phone take a picture of your calculations and insert it here to show your work. D. Click on the pencil drawing too attached to the equipotential meter: you will see a green equipotential line. Use the tool to draw equipotential lines every 0.5 m on each side from the midpoint. Take a screen shot of the picture you got and copy it here. E. Calculate the change in the potential energy ΔP of a test charge q0 = 1 pC when moved from point P( x= 1 m, y = 0) to point Q( x= 2.3 m, y = 0). 1pC = 10-12C Record your value: ΔP = 2. The Electric Field and Electric Potential Created by a Three Point Charge Distribution You will study the electric field and electric potential created by three point charges at following locations: +1nC at (x = 0 and y = +1.5 m), +1nC at (x = 0 and y = -1.5 m) and -1nC at (x = 5 m and y = 0), as shown in the picture: 2 A. Calculate the electric field at x = 2.5 m and y = 0 and compare with values obtain from the simulation: Point E magnitude calculated E direction Calculated E magnitude “Measured” E direction “Measured” Point A located at (x=2.5m, y=0) With your phone take a picture of your calculations and insert it here to show your work. B. Draw equipotential lines at this point. Draw equipotential lines by moving the equipotential meter 0.5 m away on each side of this point. Take a screen shot of your results showing the electric field vectors at different locations and the equipotential lines that you have drawn. Copy the picture here. 3 
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