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Water droplet problem/electric fields

  1. Jan 22, 2008 #1
    We just went over electric fields in class and I need help starting a problem:

    A water droplet is stationary and has radius 0.0200mm. The Electric field where the droplet is located in is 150 N/C downward. How many excess electron charges must the water droplet have?
     
  2. jcsd
  3. Jan 23, 2008 #2

    Andy Resnick

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    One clue is simply look at the units for electric field. The upward force from the field on the charges must balance the downward force from gravity.
     
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