Basic Electricity Question - Potential Electric

  • #1
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Homework Statement



Question: a plate carries a charge of -3.0 uC, while a rod carries a charge of +2.0 uC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?


The Attempt at a Solution



N= q/e = -2.0e-6/-1.6e-19 = 1.25e13 electrons transferred

something doesn't seem right about this problem. the prof didnt mark this wrong, but he marked -2.0e-6 C wrong? anyone with the fix?
 

Answers and Replies

  • #2
Galileo
Science Advisor
Homework Helper
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If you transfer 2uC from the rod to the plate, what will be the charges on both objects?
 
  • #3
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If you transfer 2uC from the rod to the plate, what will be the charges on both objects?
-3.0 uC and +2.0 uC ...when you sum them up you get -1.0 uC? each with -0.5 uC? then, 2.5 uC when you subtract from 3.0 uC?

find how many electrons in 2.5 uC? is that how much is transferred?

too many questions!!!!:confused: :confused: :confused:
 
  • #4
960
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think thats right, eg taking away from one and giveth to the other;
-3-deltaC=2+deltaC so -2.5uC
 
  • #5
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^^that's it right? just calculate electrons for 2.5 uC and that's that right?
 
  • #6
960
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You're good best I can tell, but technically its -2.5uC, some profs might not care, others most definitely will.
 
Last edited:
  • #7
132
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appreciate it doc. i'll go ahead and take your word.
 

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