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Two dipoles on an axis. There is one point where the E field vanishes.

  1. Dec 11, 2012 #1
    1. The problem statement, all variables and given/known data
    49sNn.png
    THE ANSWER IS C


    2. Relevant equations
    None given. Pondering:

    E=(1/(2(pi)εnaught))(σ/z^3)
    p=qd
    U=-p dotprod E


    3. The attempt at a solution
    We have attempted many variations of the above equations to try and find the answer. We are just seeking a point in the right direction as we are currently reviewing for a final. Any help is appreciated, thank you!
     
  2. jcsd
  3. Dec 11, 2012 #2

    ehild

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    The relevant equation is given in the problem text:
    . You have two dipoles, one of magnitude p1=27 Cm, the other p2=1Cm at distance L from each other. What is their resultant field at distance x from the bigger one?

    ehild
     
  4. Dec 12, 2012 #3
    We're still confused :(
     
  5. Dec 12, 2012 #4

    Simon Bridge

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    If you put the origin at the position of the bigger dipole - can you write the equation for the combined field at position x?
     
  6. Dec 12, 2012 #5

    ehild

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    What confuses you? :smile:

    You certainly know what a dipole is: you can imagine it like a compass, but it is electric instead of being magnetic. There is an electric field around it, as if it were a pair of charge, a positive and a negative, some small distance apart. You also know that the electric field strength is the force exerted on unit positive charge: it has direction. Place a positive charge at distance x to the right from the 27Cm dipole. What is the direction of the force it exerts on the charge? What is the direction of the force the other dipole exerts?

    ehild
     

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