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Do Electrons Attract AND Repel?

  1. Feb 23, 2010 #1


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    Bit confused here. Electrons repel each other because they both have negative charges. But wouldn't they also ATTRACT each other because of the force of gravity?

    [itex]F_{g} = \frac {Gm_{1}m_{2}} {d^{2}}[/itex]

    Do two electrons by this law have a force of gravity that attracts them? Is it possible to get two identically charged particles to ATTRACT if the force of gravity given by the above formula is GREATER than the repulsive electron force?
  2. jcsd
  3. Feb 23, 2010 #2
    Everything you say is correct. But for fundamental particles, the electric repulsion will always be much greater than the gravitational attraction. However, if you give the earth and moon each one electron charge, the gravitational attraction will still be dominant :-)
  4. Feb 23, 2010 #3
    You're correct. The electron repels each other because of the same charge but attracts because of the gravitational force. Both kinds of force obeys the square law (force is proportional to [tex]\frac{1}{r^2}[/tex]). Two things repelling or attracting depending on charge and mass of themselves.
  5. Feb 7, 2012 #4
    Why don't electrons in the same orbital repel each other
  6. Feb 7, 2012 #5


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    Of course they do! In a simple 'pictorial' model, they keep as far from each other as possible - but they are, of course, attracted to the + nucleus at the same time, which keeps them from drifting away.
  7. Feb 7, 2012 #6


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    1. Put two electrons at a fix distance from each other.

    2. Compute the electrostatic force between them.

    3. Compute the gravitational force between them.

    4. COMPARE the magnitude of both forces and see which one DOMINATES!

  8. Feb 7, 2012 #7
    Repulsive Forces in greater than Gravitational Force....
    Than why electrons does repel each other in same Orbital?
    i think due to opposite spin which create opposite magnetic field in btw Electrons As we know opposite Magnetic field of lines attracts each other.......
  9. Feb 7, 2012 #8
    why does an electron not collide with nucleus??

    why does an electron not collide with nucleus??
  10. Feb 7, 2012 #9


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    Re: why does an electron not collide with nucleus??

    https://www.physicsforums.com/showthread.php?t=511179 [Broken]
    Last edited by a moderator: May 5, 2017
  11. Feb 7, 2012 #10
    Re: why does an electron not collide with nucleus??

    For two like charges moving parallel at a relativistic speed, the magnetic component of the Lorentz force nearly cancels out the electric component of the Lorentz force. According to General Relativity, does the gravitational "force" increase, decrease, or remain the same when viewed from the rest frame of that system?
  12. Feb 7, 2012 #11


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    "Relativistic speed" relative to each other is zero, surely.
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