Electric force between objects that are in brief contact

  • Thread starter Jabababa
  • Start date
  • #1
52
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Homework Statement



Two small charged objects of the same mass and volume are brought into brief contact with each other. If the initial charges on the two objects are -3.00 x10^-6 and -1.50 x10^-6, what is the electric force between the objects when they are seperated to a distance of 0.500m after contact?

The answer is 1.82 x10^1 N

Homework Equations



F=KQ1Q2/r^2


The Attempt at a Solution



I thought it is just plug in the numbers but i get a different answer. So is there anything that goes on when they are in contact?

F= (9.0x10^9)(-3.00x10^-6)(-1.50x10^-6)/(0.500)^2
=0.162N
 

Answers and Replies

  • #2
265
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The important thing here is that they are brought into contact first.
What changes does that cause?
 
  • #3
52
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im not really sure...

umm their initial distance? Or it will have to be something to do with their charge (transfer of electro maybe)?
 
  • #4
116
2
I think the objects you have are conductors?? What happens in this case?? And anyway are you sure the result is not 1.82x10^(-1)?? (you put 10^1)...
 
  • #5
265
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I think the objects you have are conductors??
I think you have to assume they're conductors, since it gives the right answer :)

And anyway are you sure the result is not 1.82x10^(-1)??
Yes - this is the answer I got.

Jabababa - When you put two unequally charged conductors in contact, what happens to the charges on them?
 
  • #6
116
2
I think you have to assume they're conductors, since it gives the right answer :)

Just as I thought :smile:
 

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