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coolsday

  • one year ago

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

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  1. theEric
    • one year ago
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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?

  2. coolsday
    • one year ago
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    what do you mean by polarity?

  3. coolsday
    • one year ago
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    and is the magnetic force equation F=BILsintheta?

  4. theEric
    • one year ago
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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!

  5. theEric
    • one year ago
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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. coolsday
    • one year ago
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    no it dosent

  7. coolsday
    • one year ago
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    Hey, can you help me with a question?

  8. theEric
    • one year ago
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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!

  9. coolsday
    • one year ago
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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?

  10. theEric
    • one year ago
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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.

  11. coolsday
    • one year ago
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    how about "forces vary directly with the product of the charges/masses"?

  12. theEric
    • one year ago
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    Right! Throw in that distinction between gravitational and electrostatic.

  13. theEric
    • one year ago
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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.

  14. coolsday
    • one year ago
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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?

  15. theEric
    • one year ago
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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.

  16. theEric
    • one year ago
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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.

  17. theEric
    • one year ago
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    Wait, not opposite, I was right, I think :)

  18. theEric
    • one year ago
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    I'm pretty sure I'm right :) All but positive.

  19. theEric
    • one year ago
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    99% Just tired :P

  20. coolsday
    • one year ago
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    would the magnetic field be like this |dw:1398305079394:dw|

  21. theEric
    • one year ago
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    Yep. If north is up and east is right, you're correct.

  22. theEric
    • one year ago
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    So the current would be to the right.

  23. theEric
    • one year ago
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    The current, when considered "conventional current," is the flow of positive charge.

  24. coolsday
    • one year ago
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    ok, so the force would be perpendicular to both the current and magnetic field?

  25. theEric
    • one year ago
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    Right.

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