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A very long uniform line of charge has a charge per unit length of 4.82 uC/m

  1. Feb 6, 2009 #1
    1. The problem statement, all variables and given/known data
    A very long uniform line of charge has charge per unit length 4.82 uC/m and lies along the x-axis. A second long uniform line of charge has charge per unit length -2.46 uC/m and is parallel to the x-axis at y1= 0.418
    1-)What is the magnitude of the net electric field at point y2= 0.202 m on the y-axis?
    2-)What is the direction of the net electric field at point y2= 0.202 m on the y-axis?
    -y-axis
    +y-axis
    3-)What is the magnitude of the net electric field at point y3= 0.608 m on the y-axis?
    4-)What is the direction of the net electric field at point y3 = 0.608 m on the y-axis?
    -y-axis
    +y-axis


    2. Relevant equations

    EA=PA/epsilon-nought
    E=kq/r2


    3. The attempt at a solution

    I don't really know where to start.
    At first I tried to do E=(k*dq)/r^2 = k(4.82e-6)/(x^2+.202^2)
    But then realized that I don't have a definite integral. Then I tried to use E=(kq1/r1)+(kq2/r2)... but the answer was incorrect. Anyone know how to start this problem..?
     
  2. jcsd
  3. Feb 6, 2009 #2

    LowlyPion

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