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Gravitational lines of force for two equal point masses?

  1. Jan 24, 2010 #1
    Gravitational "lines of force" for two equal point masses?

    1. The problem statement, all variables and given/known data
    "Sketch the gravitational "lines of forces" for two equal point masses. These are isomorphic to the electrostatic lines of force of
    A. Two equal "+" point charges.
    B. No pair of point charges separated by the same distance.
    C. Two equal "-" point charges."


    2. Relevant equations
    None; E= F/Q; E=KQ/X^2


    3. The attempt at a solution
    My only question is wouldnt two "+" point charges and two "-" point charges have the same electric field line diagram?
     
  2. jcsd
  3. Jan 24, 2010 #2
    Re: Gravitational "lines of force" for two equal point masses?

    Yes, except the arrows will point in opposite directions, because the arrow points along the route a positive charge would take if placed in that spot. Would a positive charge move in the same direction regardless of if the two point charges making the field were both positive or both negative?
     
  4. Jan 24, 2010 #3
    Re: Gravitational "lines of force" for two equal point masses?

    Yes? Whats choice "B" trying to state?
     
  5. Jan 24, 2010 #4
    Re: Gravitational "lines of force" for two equal point masses?

    The yes was directed toward your "only question." B is worded awfully weird, but I assume it means 1 + and 1 - charge.
     
  6. Jan 24, 2010 #5
    Re: Gravitational "lines of force" for two equal point masses?

    So , intuitively, two "+" equal charges would represent the lines of the electric field for two equal point masses because two "-" charges would mean that electric field lines would have to show up out of no where and thats not possible. Correct?
     
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