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coolsday Group Title

What is the similarties and differences among electrostatics, gravitational and magnetic forces?

  • 6 months ago
  • 6 months ago

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  1. theEric Group Title
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    I'm a little busy, but I'll give you suggestions. Look at the form of their equations. Think; is does this force depend on some sort of polarity?

    • 6 months ago
  2. coolsday Group Title
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    what do you mean by polarity?

    • 6 months ago
  3. coolsday Group Title
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    and is the magnetic force equation F=BILsintheta?

    • 6 months ago
  4. theEric Group Title
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    I mean things like like charges repel, opposite charges... like poles repel, opposite poles... matter.... err.... uhh... yeah. That sort of thing!

    • 6 months ago
  5. theEric Group Title
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    There are lots of equations for magnetic force! It depends on what you look at the magnetic force of! Most importantly, does it look like the equations for electrostatic and gravitational forces?

    • 6 months ago
  6. coolsday Group Title
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    no it dosent

    • 6 months ago
  7. coolsday Group Title
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    Hey, can you help me with a question?

    • 6 months ago
  8. theEric Group Title
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    Right! :) How do the electrostatic and gravitational forces compare to each other though? :) Maybe... I'm getting distracted from my own homework, but I should focus... It doesn't hurt to post it anyway!

    • 6 months ago
  9. coolsday Group Title
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    the electrostatic forces and gravitational forces are similar in equation except for their constants. They increase with a direct proportion of their masses and decrease inversely with the distance squared. However, electrostatic forces can attract and repel while gravitational forces can only attract. Is there anything else?

    • 6 months ago
  10. theEric Group Title
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    I think that's great! I would specify "direct proportion of \(\sf the\ product\ of\) their masses," just to be picky.

    • 6 months ago
  11. coolsday Group Title
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    how about "forces vary directly with the product of the charges/masses"?

    • 6 months ago
  12. theEric Group Title
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    Right! Throw in that distinction between gravitational and electrostatic.

    • 6 months ago
  13. theEric Group Title
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    Maybe say "decrease directly" or something.. What wording is proper confuses me sometimes. You could get away with directly proportional to the product of masses for gravitational and charges for electrostatic and inversely proportional to the square of the length of separation or something like that.

    • 6 months ago
  14. coolsday Group Title
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    ok thanks. Can you help me with another one? A horizontal 6 m long wire that runs from west to east is in a 0.03 T magnetic field with a direction that is northeast. If a 4.5 A current flows east through the conductor, then what is the magnitude and direction of the force on the wire? I found the magnitude to be 0.5 N but how would i find the direction of the force?

    • 6 months ago
  15. theEric Group Title
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    I'll just trust your magnitude, because I forget the equation for current. I think you posted it above, though. Anyway.... The right hand rule! Take your right hand, fingers outstretched. Point it in the direction of the current. Now curl your fingers so that they align with the magnetic field, but don't move your palm. Stick your thumb out. Your thumb points to the direction of the force.

    • 6 months ago
  16. theEric Group Title
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    Actually, opposite. That is because of the cross product. \(\vec x\times\vec y=\vec z\) in our coordinate system, so I remember that. For the magnetic force on a moving charge, its \(q\vec v\times\vec B=\vec F\) where \(\vec v\) is the velocity and \(\vec B\) is the magnetic field.

    • 6 months ago
  17. theEric Group Title
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    Wait, not opposite, I was right, I think :)

    • 6 months ago
  18. theEric Group Title
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    I'm pretty sure I'm right :) All but positive.

    • 6 months ago
  19. theEric Group Title
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    99% Just tired :P

    • 6 months ago
  20. coolsday Group Title
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    would the magnetic field be like this |dw:1398305079394:dw|

    • 6 months ago
  21. theEric Group Title
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    Yep. If north is up and east is right, you're correct.

    • 6 months ago
  22. theEric Group Title
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    So the current would be to the right.

    • 6 months ago
  23. theEric Group Title
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    The current, when considered "conventional current," is the flow of positive charge.

    • 6 months ago
  24. coolsday Group Title
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    ok, so the force would be perpendicular to both the current and magnetic field?

    • 6 months ago
  25. theEric Group Title
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    Right.

    • 6 months ago
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