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Electric Field question

  1. Feb 2, 2010 #1
    1. The problem statement, all variables and given/known data

    How does E depend on r?

    2. Relevant equations

    E(r) = -dV/dr

    v = -224.1r + 22.17

    3. The attempt at a solution

    dv/ dr = -224.1
    E= 224.1

    I need an equation that relates E and r, but r drops out when I differentiate...
     
  2. jcsd
  3. Feb 2, 2010 #2

    Pengwuino

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    Gold Member

    Was this potential just given to you?
     
  4. Feb 2, 2010 #3
    Potential? The equation with volts and radius (v = -224.1r + 22.17) is from my experiment, and the other (E = -dV/dr) is from my book.
     
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