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

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theEric
 10 months ago
Best ResponseYou've already chosen the best response.1I'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?

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0what do you mean by polarity?

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0and is the magnetic force equation F=BILsintheta?

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1I mean things like like charges repel, opposite charges... like poles repel, opposite poles... matter.... err.... uhh... yeah. That sort of thing!

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1There 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?

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0Hey, can you help me with a question?

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1Right! :) 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!

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0the 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?

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1I think that's great! I would specify "direct proportion of \(\sf the\ product\ of\) their masses," just to be picky.

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0how about "forces vary directly with the product of the charges/masses"?

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1Right! Throw in that distinction between gravitational and electrostatic.

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1Maybe 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.

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0ok 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?

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1I'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.

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1Actually, 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.

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1Wait, not opposite, I was right, I think :)

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1I'm pretty sure I'm right :) All but positive.

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0would the magnetic field be like this dw:1398305079394:dw

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1Yep. If north is up and east is right, you're correct.

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1So the current would be to the right.

theEric
 10 months ago
Best ResponseYou've already chosen the best response.1The current, when considered "conventional current," is the flow of positive charge.

coolsday
 10 months ago
Best ResponseYou've already chosen the best response.0ok, so the force would be perpendicular to both the current and magnetic field?
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