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Homework Help: Charge & E-Field: Sum of Vectors of 3 different charge

  1. Jan 22, 2012 #1
    A positively charged particle is placed along the positive x axis and a particle carrying a negative charge of equal magnitude is placed at equal distance from the origin along the negative x axis. A third particle carrying a positive charge is placed on the y axis. The vector sum of the forces exerted by 1 and 2 on 3 is directed


    1. in the +x direction.
    2. in the -x direction.
    3. along the y axis.
    4. toward particle 1.
    5. along another direction.

    I tried: 1. in the +x direction. and 3. along the y axis.
  2. jcsd
  3. Jan 24, 2012 #2
    Draw a free body diagram and use symmetry. Consider the force vectors from charge1 and charge2 one at a time, and add them together as per usual. Note the similarities in the forces exerted on charge3 by charge2 and charge1.
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