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Homework Help: Net Electric Field Vector

  1. Jan 25, 2009 #1
    1. The problem statement, all variables and given/known data

    Two equal charges +6 μC are placed, one at <−1, 0, 0>m and the other at <5, 0, 0> m. What is the net electric
    field vector at the location A which is at <0, 0, 0>m? Show your work.

    2. Relevant equations

    E=KQ/|r|^2 * |r|

    3. The attempt at a solution

    r1=<0,0,0>-<-1,0,0>=<1,0,0>

    E1= k*(6x10^-9)/1 * <1,0,0>= <54,0,0>

    r2= <0,0,0>-<5,0,0>= <-5,0,0>

    E2= k*(6x10^-9)/(5^2) * <10.8/25,0,0>= <.93312,0,0>

    E1+E2=ENet

    Enet= <54,0,0>+<.93312,0,0>=

    <54.93312,0,0>
     
  2. jcsd
  3. Jan 25, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    This should be:

    E=KQ/|r|^2 * [itex]\hat r[/itex]

    OK.

    Recalculate E2.
     
  4. Jan 26, 2009 #3
    Thanks Doc Al!
     
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