Electric Fields of Dreams Lab

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Rowan College of South Jersey, Sewell *

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202

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Physics

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Dec 6, 2023

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docx

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Eric Wesnofske Electric Fields of Dreams Lab PHY202 By convention, a negatively-charged monopole has electric field lines moving into the object. A positively-charged monopole has electric field lines moving out of the object. In this experiment, you will visualize the effects of the movement of one or more negative charges across an applied external field. 1. Open the simulation at https://phet.colorado.edu/sims/cheerpj/efield/latest/efield.html?simulation=efield and click “Run”. 2. Click “Add” to place a charged object on the screen. Write down your observation. Is the object in motion? The object is not in motion and the arrows are pointed towards the ball. 3. Based on convention, what is the charge of the monopole? 0 4. With your cursor, push the object. Observe the behavior of the field lines in the vicinity of the object. In your own words, how would you describe the behavior of the lines? The lines get longer the closer they are to the object. 5. To add an additional object, press “add” one more time. Observe the initial behavior.  Once inserted, does the second object remain at rest? No  What “pushes” the second object? The lines  Is the interaction between the two objects an attraction or a repulsion? Repulsion  What is the charge of the second object? Negative How do you know? Because they both repel each other so they are both negative. 6. Within the constraints of the box, does the second object ever move faster than the first object? Why or why not? They both move around the same speed because they have the same mass and have the same charge. 7. Press “Reset All” and confirm “Yes”. Press “Add” twice in rapid succession.  In Step 2, one object was at rest when introduced in the box. Is this true now that you have introduced two objects? No  What force provides the “push” in this case? The lines and the repulsion of the objects 8. Press “Reset All” and confirm “Yes”. Press “Add” once to place an object in the box. Notice that the initial state of the object is static (at rest), again.

9. Pull the “External Field” point down so that it forms a downward-pointing arrow. Record your observations. When the arrow is pulled down the ball wants to stay at the top of the box by bouncing off the top. 10. Change the orientation and length of the “External Field” and observe the behavior of the object.  Based on your observations, what is the charge that generated the external field, negative or positive? Negative  Shorten the external field arrow and observe the change in size and orientation of the field lines close to the object. You can get the arrows to reverse directions. Based on this additional observation, was your initial designation of the charge that generated the external field correct? Knowing this, is the field negative or positive? Negative 11. Press “Reset All” and confirm “Yes”. Press “Add” once to place an object in the box. Click “Electric Field” in the top bar and click on “Electric Field Discreetness”. Slide the bar to the right to the maximum value of 30. Observe the behavior of the object and the aspect of the electric field around it. Describe your observations. The object tends to move much faster than when the directness was at its default value. Also, there were a lot more lines in the electric field with the directness at 30. 12. Reduce the discreetness and observe the field lines. Does the object remain at rest with these changes? The object does not remain at rest. 13. Reset the discreetness to 10. Press “Add” to add another object. How do the two objects move? The 2 objects move very similarly to how they moved before at the beginning of this lab. 14. Change the direction and length of the external field arrow and observe. Explain what happens when you change the external field direction and strength. The objects want to go in the opposite direction of the lines just like before. The length of the lines determine the how much the lines will repel the objects.

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