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UVA PHYS 632 - Warm-up set

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Warm-up set 2 1. [153709] Can there be an electric field at a point where there is no charge? Can a charge experience a force due to its own field? Please write a one or twosentence answerfor each question.Answer:Yes, a charge creates an electric field at distances from the charge. Thus the fieldextends beyond the position of the charge itself to points where there is nocharge present.No, a charge cannot experience force due to its own field because Coulomb’s lawrequires two charges to create equal and opposite repulsive or attractive electricforce.Question2. [153707] An insulator is a material that... (a) three are correct (b) is not penetrated by electric fields (c) none of these (d) cannot carry an electric charge (e) cannot feel an electrical forceAnswer:(c) None of theseAlthough it is more easily done with conductors, electrons can be added andremoved from insulators to give them electric charge.Even neutral insulators can feel an electric force due to polarization of theindividual molecules.Question3. [153708] Which of the following is true of a perfect conductor ? (a) There can be no electric charge on the surface. (b) There cannot be an electric field inside. (c) There cannot be any excess electric charge inside. (d) There cannot be any electric charges inside. (e) Two of the choices are correctAnswer:(e) Two of the choices are


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UVA PHYS 632 - Warm-up set

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