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Homework Help: Potential -> electric field. Almost done, need a little help.

  1. Apr 10, 2010 #1
    Potential --> electric field. Almost done, need a little help.

    1. The problem statement, all variables and given/known data
    The potential in a region between x=0 and x=6.00m is V=a+bx.
    a=10[V/m]
    b=-7[V/m2]
    Determine a) the potential at x=0, 3m, and 6m
    b.) the electric field at the same locations



    2. Relevant equations
    3. The attempt at a solution
    So I got stuck on part b. It says along x so I disregarded y and z. Partial of V with respect to x is -b which equals 7 but the units are V/m2 which doesn't seem right at all.
    What did I screw up?
    [ physics230ch2512.jpg /b]
     
  2. jcsd
  3. Apr 10, 2010 #2

    ehild

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    Homework Helper

    Re: Potential --> electric field. Almost done, need a little help.

    It was not your error. As the unit of the electric potential is V, the units for the constants are wrong: a should be in volts, and the unit of b is V/m.

    ehild
     
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