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How does a particle detect the presence of another?

  1. May 12, 2015 #1
    How does a particle detect the presence of another? And also how does it know whether to attract or to repulse without even interacting with one another?
  2. jcsd
  3. May 12, 2015 #2


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  4. May 12, 2015 #3
    How does it differentiate between +vely and -vely charged particles? And know the exact force to be applied on the particle; not more, not less: just exact? is there something i am really missing out?
  5. May 12, 2015 #4
    as robfy said, through the fields. their magnitude and direction convey the information of how much force to experience and in which direction depending on whether the particle experiencing them is negatively or positively charged.
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