1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Particle charge

  1. Jan 30, 2006 #1
    A particle of mass 73 g and charge 38muC is
    released from rest when it is 46 cm from a
    second particle of charge -17muC.
    Determine the magnitude of the initial ac-
    celeration of the 73 g particle. Answer in units
    of m/s^2.

    Well, I used this formula:

    k [(q1 * q2) / mr^2)]

    8.98755*E9 [(38*17)/ ((73/1000)*(.46^2))]

    edit - fixed typo

    = 3.7586 * E14

    But it's wrong... any help appreciated. Thanks.
    Last edited: Jan 30, 2006
  2. jcsd
  3. Jan 30, 2006 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Make sure the units are correct, and square the (46 cm) or 0.46 m if using MKS.
  4. Jan 30, 2006 #3
    that was a typo on my part... i did indeed square it when i got the wrong answer. Anything look off to anyone?
  5. Jan 30, 2006 #4
    I'm an idiot. I forgot to multiply the charges by mu(micro) 10^-6.

    I got it now. =) Thx astronuc.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook