Physics Review Question Unit: Electricity & Magnetism Year: 1988 Question#: 28 Question: An oil drop has a charge of -4.8 x 10-19 coulomb. How many excess electrons does the oil drop have? (1 ) 1.6 x 10-19 (2 ) 2.0 (3 ) 3.0 (4 ) 6.3 x 1018 What is this question really asking? Explanation by: Yui H. [ Return to question menu ] Answer 1 1.6 x 10-19 incorrect This answer is incorrect because in order to get the number of excess electrons, the charge of an substance is divided by the one elementary charge of the electron(constant). When -4.8 x 10-19 is divided by 1.6 x 10-19 (constant) the answer is 3.0 Answer #1 is number of one elementary charge of the electron. return to top Answer 2 2.0 incorrect This answer is incorrect because in order to get the number of excess electrons, the charge of an substance is divided by the one elementary charge of the electron(constant). When -4.8 x 10-19 is divided by 1.6 x 10-19 (constant) the answer is 3.0 It does not equal 2.0 return to top Answer 3 3.0 correct This answer is correct because in order to get the number of excess electrons, the charge of an substance is divided by the one elementary charge of the electron(constant). When -4.8 x 10-19 is divided by 1.6 x 10-19 (constant) the answer is 3.0 return to top Answer 4 6.3 times 1018 incorrect This answer is incorrect because in order to get the number of excess electrons, the charge of an substance is divided by the one elementary charge of the electron(constant). When -4.8 x 10-19 is divided by 1.6 x 10-19 (constant) the answer is 3.0 Answer #4 represents one coulomb (constant). return to top What's this question really asking? How many excess electrons does the oil drop have? Also this question is testing your ability to use the reference table. return to top |
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