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Initial acceleration of a charged particle

  1. Jan 16, 2012 #1
    1. The problem statement, all variables and given/known data
    If sphere 2 were free to move its initial acceleration would be ___m/s^2


    2. Relevant equations
    Two small spheres carrying charges q1 = 7.68 µC and q2 = 5.74 µC are separated by 19.9 cm. The mass of sphere 1 is 10.5 g and the mass of sphere 2 is 15.2 g.


    3. The attempt at a solution
    Not sure how to start this one? I know the acceleration would be due to gravity but...
     
  2. jcsd
  3. Jan 16, 2012 #2

    Doc Al

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    Staff: Mentor

    I would not assume that.

    What electrostatic force do the two spheres exert on each other?
     
  4. Jan 16, 2012 #3
    Calculate Electrostatic force(F) b/w the two spheres. Since only spher 2 is free to move. the acc is F/m(of sphere 2)
     
  5. Jan 16, 2012 #4
    About .100 N

    (9.0 x 10^9)((7.68 x 10^-6)(5.74 x 10-6))/(19.9)^2
     
  6. Jan 16, 2012 #5
    (19.9* 10^-2)^2 as 19.9 is in cm
     
  7. Jan 16, 2012 #6
    ans is 11.48 m/s^2
     
  8. Jan 16, 2012 #7
    Wow thank you for catching that simple error, and thanks for all the help
     
  9. Jan 16, 2012 #8
    check whether the answer is correct and Your welcome:)
     
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