Physics Review Question Unit: electricity Year: 1997 Question#: 26 Question: What is the net static electric charge on a metal sphere having an excess of +3 elementary charges? (1 ) 1.6 x 10-19C (2 ) 4.8 x 10-19C (3 ) 3.0 x 100C (4 ) 4.8 x 1019C What is this question really asking? Explanation by: Danny A [ Return to question menu ] Answer 1 1.6 x 10-19C INCORRECT This is incorrect because you forgot to multiply it by 3 elementary charges. The value you chose is just the number of coulombs in 1 elementary charge. return to top Answer 2 4.8 x 10-19C CORRECT All you do for this one is look it up in your reference tables which says there are 1.6 x 10-19 coulombs in one elementary charge. For 3 elementary charges all you do is multiply it by 3 which ends up to be this answer. return to top Answer 3 3.0 x 100C INCORRECT There is more to this question than trying to symply convert the number 3 into scientific notation. You must convert 3 elementary charges into coulombs of charge...consult your reference table to find the number of coulombs per elementary charge. return to top Answer 4 4.8 x 1019C INCORRECT All they tried to do here is mix you up with the 19 being positive instead of negative. return to top What's this question really asking? How many coulombs of charge are in three elementary charges? return to top |
[Home] [Lessons] [Review] [Search] [Links]
This web site is designed and maintained by Science Joy Wagon and may
not be reproduced or redistributed without written permission from Science Joy Wagon. |