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Homework Help: Electric field problems

  1. Jan 31, 2010 #1
    I need help getting started on a few questions. If you could just provide the equation I should use then I would be very thankful.

    1. A point charge of 2Q is a distance L from a point charge of -Q. What is the electric field at Point P a distance L abouve the center of the 2 charges. Picture below:

    2. What would the force be on a -Q charge placed at the point a distance L above the center of the charges in the problem above.

    3. What is the electric field a distance of 0.5 meters above an infinite plain of charge density 25C/m^2

    4. If the center of a flat plate wish a radius of 5cm is placed at an angle of π /3 radians, 1 meter above the infinite plain from the previous problem, then what would be the flux through the plate?

    5. What would be the electric field a distance R away from an infinite wire with a charge density of λ
  2. jcsd
  3. Feb 1, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi kmjones26! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    1. Electric field is a vector, so find the two vectors at P from the two charges, and add the components.

    2. Force = charge times electric field (F = qE). :wink:

    Show us what you get. :smile:
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