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Electric Field/Force Problem

  1. Jan 30, 2007 #1
    1. What must the charge (sign and magnitude) of a 1.45 g particle be for it to remain stationary when placed in a downward directed electric frield of magnitude 650N/C? also What is the magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight.

    What do I do?
  2. jcsd
  3. Jan 30, 2007 #2


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    Compute the gravitational force and the electric force and set them equal and opposite, right? What else would you do?
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