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Homework Help: Force on a charge obtained from electric potential

  1. Sep 16, 2015 #1
    1. The problem statement, all variables and given/known data

    In a certain region of space, the electric potential along the x-axis is given by:

    V = 111x3 - 517x - 258 where V is in Volts and x is in meters.

    Find the force F (magnitude in N and direction) felt by a -444 μC point charge at point (56.5 cm,0). (For direction, all you need is the sign.)

    2. Relevant equations

    3. The attempt at a solution


    ⇒ E(0.565m)=-668.7 N/C


    The answer turned out to be wrong so if someone can give me a hint towards where my mistakes are I would greatly appreciate it!
  2. jcsd
  3. Sep 16, 2015 #2


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    What is the derivative of 258 with respect to x?
  4. Sep 16, 2015 #3
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