Electrostatic Force

  • Thread starter Aamun
  • Start date
  • #1
10
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Homework Statement


A metal sphere with a negative charge of 3.00x10^-6C is placed 12.0 cm from another similar metal sphere with a positive charge of 2.00x10^-6C. The two spheres momentarily touch, then return to their original positions. Calculate the electrostatic force acting on the two metal spheres.


Homework Equations



Fe=kq1q2/r^2

The Attempt at a Solution



Fe=(8.99x10^9)(3.00x10^-6)(2.00x10^-6)/(.12^2)
Fe=3.75 N [Repulsive]

For some reason the above formula wont work to get the answer that it says, am I doing something wrong?

Answer should be 1.56x10^-1 N [Repulsive]
 

Answers and Replies

  • #2
346
0
what happends when the 2 charges touch? Charge is transferred, therefore you have to find out the final charge on eache sphere before you can use the formula.
 
  • #3
10
0
Oh yeah! Ok thanks I got it now!
 

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