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# lect547 - 1 A handheld glass can be charged by rubbing it...

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1. A handheld glass can be charged by rubbing it with silk or a plastic bag while holding it in your hands. Would you conclude from this that glass is a conductor or an insulator? Why? 2. Why it is easier to charge a balloon on a dry day than on a humid day? 3. Why are neutral objects attracted to both negatively and positively charged objects?

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1. When Coulomb was developing his law, he did not have an instrument for measuring charge. And yet he was able to obtain spheres with ½ ; 1/3; ¼;… of some original charge. How might he have used a set of identical spheres to do this? 2. You have three identical metal spheres on insulating stands. The spheres hold charges Q A = -2q; Q B = -q; Q C =4q. First, sphere A is brought into contact with sphere C and separated. Second, sphere C is brought into contact with sphere B and separated. What is the resulting charge on sphere B?
The Electric Field

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The electric field E at a point in space is defined as an electric force F , acting on a positive test charge q divided by the magnitude of the test charge
Units of Electric Field 1 N/C

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Superposition Principle for Electric Fields
Field Lines

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lect547 - 1 A handheld glass can be charged by rubbing it...

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