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Homework Help: Electric fields and acceleration

  1. Sep 27, 2006 #1
    Consider a long horizontal conducting wire with charge density
    = 5.70*10^-12 C/m. A proton (mass = 1.67*10^-27 kg) is placed and
    released 0.820 m above the wire. What is the magnitude of initial
    acceleration of the proton?

    My thought is: a=q*E/m

    and E is: 2*k*charge density/distance to the proton or 2*8990000000*5.7*10^-12/.820m

    but I can't get the right answer, which I know to be: 1.199*10^7.

    Any thoughts??
  2. jcsd
  3. Sep 27, 2006 #2


    User Avatar

    Staff: Mentor

    Sounds like you are on the right track, but I don't have my E&M books at home (where I am now). What is the equation that you are using for the electric field from a uniform linear charge distribution?
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