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coolsday

  • 7 months ago

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

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  1. theEric
    • 7 months 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
    • 7 months ago
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    what do you mean by polarity?

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

  4. theEric
    • 7 months 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
    • 7 months 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
    • 7 months ago
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    no it dosent

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

  8. theEric
    • 7 months 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
    • 7 months 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
    • 7 months 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
    • 7 months ago
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    how about "forces vary directly with the product of the charges/masses"?

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

  13. theEric
    • 7 months 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
    • 7 months 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
    • 7 months 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
    • 7 months 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
    • 7 months ago
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    Wait, not opposite, I was right, I think :)

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

  19. theEric
    • 7 months ago
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    99% Just tired :P

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

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

  22. theEric
    • 7 months ago
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    So the current would be to the right.

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

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

  25. theEric
    • 7 months ago
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    Right.

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