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Homework Help: Charges on Conductors and Gauss's Law

  1. Oct 18, 2004 #1
    Can someone give me a couple hints to get me started on this problem, Im not sure where to go next.

    Infinite line of charge has charge per unit unit length 4.8*10^-6 and lies along the x axis. A second uniform line of charge with charge/unit length
    -2.4*10^-6 is parallel to the x axis at y=4. What is the net electric field at y=2 and y=6?

    I used the formula E= lamda/2(pi)(epsilon naught)(r) but I am not sure what to put in for r and where to go next.
  2. jcsd
  3. Oct 18, 2004 #2


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    You calculated the electric field produced by the individual line charges so all you have to do is add them to find the total field. You just have to remember that the "r" in each expression represents the distance from a point in space to the line charge AND the direction of the field due to each line charge is given by the displacement VECTOR from the point in space to the line charge.

    It's worth noting that there is no x-component to any of these vectors.
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