Distance between charges.

  • Thread starter rcmango
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  • #1
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Homework Statement



Two charges attract each other with a force of 3.0 N. What will be the force if the distance between them is reduced to one-ninth of its original value?

Homework Equations



(rA/rB)^2

The Attempt at a Solution



not sure how to find this.
 

Answers and Replies

  • #2
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What is rA and rB?
 
  • #3
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sorry was a formula, i figured it out though,

(rA/rA9)^2 = 81

81* 3.0 N. = 243 N

Okay so i got the answer, maybe someone could explain what is going on if you will?
 
  • #4
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Use Coulomb's law directly. Take the charges to be q1 and q2, and the initial dist between them to be r.
 

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