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Force of magnets

by aneima6
Tags: force, magnets
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aneima6
#1
Oct26-05, 01:38 AM
P: 12
Magnet A has twice the magnetic field strength of magnet B (at equal distance) at a certain distance and pulls on the magnet B with a force of 30N. Determine the force with which magnet B pulls magnet A.
Could someone help me. I'm just starting physics in hs.
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Tide
#2
Oct26-05, 01:44 AM
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Do you have any reason to believe the forces will be different - i.e. Newton's law of action reaction does not apply?
aneima6
#3
Oct26-05, 01:48 AM
P: 12
thats probably correct. this is a basic question. i think it is getting at coulombs law.

i think the answer is 15N. not sure

Tide
#4
Oct26-05, 01:53 AM
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Force of magnets

If you're talking about magnets you're probably not dealing with Coulomb's law.

So, why do you think the answer is 15 N?
aneima6
#5
Oct26-05, 01:58 AM
P: 12
well i'm not exactly sure. i'm looking in the chapter of magnetism in my book and i don't see any forumla's. its weird. i went back a chapter and found coulombs which deals with force=(k)(q1q2)/d^2.

i wasn't sure if it was right or now. if you could help me on a formula i could try and solve it. thanks

jeff
aneima6
#6
Oct26-05, 01:59 AM
P: 12
i think because magnet a is twice as strong, that magnet b is half of its strength.

also i forgot a few parts of the question that might help

it has twice the magnetic field strength.
Tide
#7
Oct26-05, 02:56 AM
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I have no idea what equations your textbook shows but if you have none relating the pulling force of a magnet that should be a clue for you!

Remember Newton's Law that I mentioned earlier and think about this: If a magnet is twice as strong then not only it will it pull another with twice the force it will also be pulled with twice the force!
aneima6
#8
Oct26-05, 11:44 AM
P: 12
so the answer is that since they are an equal distance away. that the force that a acts upon b is the same force that b acts upon a.

answer 30N?


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