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Thread: electric potential energy

  1. #1 electric potential energy 
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    what will happen to the electric potential energy of a charged particle in an electric field when the particle is released and free to move?

    a. it will increase
    b. it will change into kinetic energy
    c. it will remain unchanged


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  3. #2  
    Forum Ph.D. william's Avatar
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    Let me ask this related question;
    Will the particle move, of remain stationary?
    What's your guess?


    Cheers


    "... the polhode rolls without slipping on the herpolhode lying in the invariable plane."
    ~Footnote in Goldstein's Mechanics, 3rd ed. p. 202
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  4. #3  
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    i think that it will move
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  5. #4  
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    Quote Originally Posted by european SENS
    i think that it will move

    Sounds reasonable.

    Based on this, can we eliminate any of the choices for the answer (i.e., get rid of a, b, or c)?
    "... the polhode rolls without slipping on the herpolhode lying in the invariable plane."
    ~Footnote in Goldstein's Mechanics, 3rd ed. p. 202
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    well if something is moving, then it will travel a distance, which as a result will increase potential energy so shouldn't the answer be A then?
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    Okay...
    Perhaps a better way to think about this is to imagine a similar, but more familiar experiment.

    Picture holding a ball in your outstretched arm. The ball has potential energy since it is above the ground, and gravity wants to pull it down.

    If you let the ball go, it is free to move, just like the charged particle in the original question.

    Now ask the same question;
    Does the potential energy
    a. increase
    b. change into kinetic energy
    c. remain unchanged



    Cheers
    "... the polhode rolls without slipping on the herpolhode lying in the invariable plane."
    ~Footnote in Goldstein's Mechanics, 3rd ed. p. 202
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  8. #7  
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    A charged particle in an electric field is like a mass object under the influence of the gravitational field. Once the particle is let go, it will move to lower potential, and its potential energy will be converted into kinetic energy as the particle accelerates.
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  9. #8  
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    Quote Originally Posted by european SENS
    A charged particle in an electric field is like a mass object under the influence of the gravitational field. Once the particle is let go, it will move to lower potential, and its potential energy will be converted into kinetic energy as the particle accelerates.

    See... it's not so hard.
    Good job!
    "... the polhode rolls without slipping on the herpolhode lying in the invariable plane."
    ~Footnote in Goldstein's Mechanics, 3rd ed. p. 202
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  10. #9  
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    Quote Originally Posted by european SENS
    well if something is moving, then it will travel a distance, which as a result will increase potential energy so shouldn't the answer be A then?
    You are asking to broad a question if you ask me. A single electron is not really electricity. Electricity actually works by the creation of a diode, that causes a potential for electrons to flow from the diode. Or to flow to the diode.

    The diode deflects ambient radiation, to create the effect of electricity. I could not imagine talking about one electron as electricity.

    When you divert ambient radiation electrons, to create current flow. The current flow is equalizing the pressure , electron potential, or electromotive force, created by the diode. Electricity flow actually equalizes both sides of the diode, through a loop or circuit.

    Ambient radiation just diverts from an abundance to a shortage of electrons. That is all that makes electricity flow.

    The diode diverts ambient radiation, almost always slowing it. So in a way the creation of the diode, decreases the potential energy of ambient radiation. That is displayed as electricity.

    But we do have perpetual motion, in fact the universe runs on it. All you have to do is divert the ambient radiation to the job at hand. Most older equipment was designed to avoid perpetual motion accidents.

    If you keep raising the voltage of something. You will notice that you may get some harmonic, then maybe some heat, light and then it will explode.

    The explosion is ambient radiations true power unleashed to protect the universe from total destruction.


    Sincerely,


    William McCormick
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  11. #10  
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    IF it's truly potential energy, and we're assuming that this is the only force acting on the particle, then i would assume it would remain stationary. It's like this, if your holding a ball on a plane, and you are a about to throw the ball along the plane, with the intention of the ball staying in contact with the ball the entire time, and then you suddnel get distracted and have to leave to say, go do the dishes, then the ball will remain stationary.
    Time is a great teacher, but unfortunately it kills all its pupils ... - Louis Hector Berlioz
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    Quote Originally Posted by Behr_25
    IF it's truly potential energy, and we're assuming that this is the only force acting on the particle, then i would assume it would remain stationary. It's like this, if your holding a ball on a plane, and you are a about to throw the ball along the plane, with the intention of the ball staying in contact with the ball the entire time, and then you suddnel get distracted and have to leave to say, go do the dishes, then the ball will remain stationary.
    The ball will just hover there while you go do the dishes? Why are you doing the dishes on a plane?
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  13. #12  
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    Quote Originally Posted by Behr_25
    IF it's truly potential energy, and we're assuming that this is the only force acting on the particle, then i would assume it would remain stationary. It's like this, if your holding a ball on a plane, and you are a about to throw the ball along the plane, with the intention of the ball staying in contact with the ball the entire time, and then you suddnel get distracted and have to leave to say, go do the dishes, then the ball will remain stationary.
    EMF=Electromotive force, is, or exists because of a diode. The potential of the abundance or shortage of electrons, created by the diode. Is held as potential energy, usually by an air capacitor. Like between the two terminals of a battery.

    Take away enough air, like in a vacuum and you will notice that a flow of electrons will connect both terminals or a terminal to the case of the battery. You need the dielectric/insulator to create a barrier to stop electron flow.


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    William McCormick
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