Electric Fields Test Review

# A a plastic rod is rubbed against a wool shirt

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a) A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of -0.8x10 -6 C. How many electrons are transferred from the wool shirt to the plastic rod? 5x10 12 e’s b) A charge of 4x10 -6 C is 2m away from a 8x10 -6 C charge. What is the force between them? How would your answer differ if they are 4m away? How would your answer differ if one of the charges is doubled? 0.072N c) Three point charges are on the x axis. q 1 = -6x10 -6 C is at x=-3m, q 2 = 4x10 -6 C is at the origin, q 3 = 6x10 -6 C is at x=3m. What is the net force are charge q 1 ? 0.033N to the right 1) What do electric field lines represent? How can you tell the charge of an object by looking at the field lines? 2) If electric field lines point to the right, which way will a negative charge feel a force? 2) How can you tell the strength of a charge by looking at the electric field lines? 3) Draw electric field lines for two positive charges of equal magnitude when they are near each other. How would your drawing be different for two negative charges? 4) Draw electric field lines for a positive and negative charge when they are near each other. 5) How is electric field intensity related to the charge on the source object creating the field? 6) What happens to the electric field intensity as you get closer and farther from the source charge?

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