Workshop Tutorials for Biological and Environmental Physics ER21 1.docx - Workshop Tutorials for Biological and Environmental Physics ER2B Electric

# Workshop Tutorials for Biological and Environmental Physics ER21 1.docx

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Workshop Tutorials for Biological and Environmental Physics ER2B: Electric Fields Questions: 1. You charge up a cat by brushing it with a plastic comb so that the cat now has charge + q and the comb has charge – q . You charge up a test mouse to +1nC with a second comb, take that comb a long way away, then place the test mouse at different points in the room with the cat and the comb as shown below. (The room has a due to each charge and the net force. b. Rank the magnitudes of the electric force on the test mouse at points A, C, E and F. c. Rank the magnitudes of the electric field at points A, C E and F. d. Explain how and why your answers to part b are related to your answer for part c. e. Draw vectors showing the electric field at positions A, B, C, D, E and F. Use these vectors to help you draw field lines for the cat-comb combination. f. Are field lines “real”? Explain your answer. Two students are trying to decide where the field is strongest. Brent says that because C and D are further from the charges, the field must be weaker at these points than at A and B. Rebecca says that the field will be the same at C and D as it is at A and B because of the way the field lines are drawn. b. Draw the field lines and decide who you agree with. Explain why the other student is wrong. B. Activity Questions: 1. van de Graaff generator and wig non-conducting floor.) Treat the cat and comb as point charges. a. Draw vectors showing the electric force on the test mouse at positions A, B, C, D, E and F. Draw the force + q - q A B C D E F 2. In the figure below the + signs represent a very wide and very long sheet of charge.

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