103 replies to this topic

[SGC1one]

Wouldn`t one end of the magnetic bar be positively charged and the opposite end be negatively charged.
The non-magnatized bar would be attracted on the positive end and repelled on the negative end.

[PlayTheMindGame]

Hmm...this one's a tricky one.
Maybe hold one near the other, and see if you feel a pull with the one you're holding. If you do, the other one is magnetic. If you don't, it's the one your holding.
That's only a guess.

[dilbert]

Magnets are dipoles - therefore only one rod would repel and attract at its opposite ends. put the rods perpendicular to each other and turn on 180 degrees - if doing so goes from attraction to repulsion you know you have the magnet - if both ends either repel or attract - you know you have the non-magnet

[Chris flying one]

... Or you could just make a "T" shape with them, if it attracts then the magnet is the one "T-boning" the other... if not it's the one being T-boned.

[gagansinha]

The easiet way is to hit the ROD to the wall....the iron rod will make a mettalic sound where the magnetic rod wont.....isnt that simple

[deven.cay]

WELL. i dont know about you, but i imagine myself wearing jeans; therefore, i have a metal button. they only said there was no other metal in THE ROOM specifically, and i am not a peice of THE ROOM.

[Viruzzz]

you can do it with nothing else than the rods.
assuming the magnetic field is strong enough for you to feel the attraction between the 2 rods.

here's how:

you place 1 iron rod on the floor (or ground, whatever)
and slide the end of the second rod slowly along with the iron rod on the ground, without touching it.

the attraction is weaker at the middle of the magnetic rod, because thats where the poles cancel eachother out.

So, if the magnetic rod is lying on the floor, you will feel greater attraction at each end of the the stationary rod.

and if the non-magnetic rod is lying on the floor you will feel equal attraction at any place on the rod because you are always affecting it with the same pole.


This does assume that the magnetic force is enough for you to feel it. if it isn't then the gravitational field of the earth is your only option.

[Adie]

Magnet - Back to the Logic Puzzles
This is a logic puzzle published in Martin Gardner's column in the Scientific American.
You are in a room where there are no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify this magnet?

Well, magnets are stronger at the poles, and so you simply need to rub the two rods together. Firstly you take Rod A and hold it horizontally. Then you take Rod B and rub its one pole against the one pole of Rod A. Then, if you move Rod B along Rod A horizontally and the attraction becomes less, then you know that Rod A is the magnet. If the attraction stays the same, then Rod B has to be the magnet.

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[xXJESTERXx]

Is there a door knob on the door which is not tecnichally in the room if the door opens out? because if there is you would simply use the doorknob.

[Adie]

Is there a door knob on the door which is not tecnichally in the room if the door opens out? because if there is you would simply use the doorknob.

I don't understand? Care to explain a bit?

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