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Need to find force on a charge due to an electric field strenght, pls help

  1. Apr 15, 2010 #1
    i have a problem asking about a Electric potential field(V), form which i have to find the electric field strength vector(E).

    E=-(grad)V

    After i did this, it asks me to find the force on a charge at a point P.

    i know F=qE but this is when i have a E field due to a another charge on space, but here i have a vector field.

    I need help on knowing what i can do next coz im stuck here.

    Thanks in advance
     
  2. jcsd
  3. Apr 18, 2010 #2

    Redbelly98

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    That equation is true no matter what E is due to.
    Is this a homework problem?
     
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