The Naked Scientists

The Naked Scientists Forum

Author Topic: Cutlery which cannot be Magnetized  (Read 5128 times)

Offline mystikalneon

  • First timers
  • *
  • Posts: 6
    • View Profile
Cutlery which cannot be Magnetized
« on: 20/06/2007 13:58:24 »
Hi

i would like to ask why steel cutleries which are arranged in certain orientations are or are not magnetized by a huge electrical current.

I would really appreciate it if someone could post diagrams to aid me  ;D thanks!

Matthew


« Last Edit: 21/06/2007 04:38:15 by mystikalneon »


 

Offline mystikalneon

  • First timers
  • *
  • Posts: 6
    • View Profile
Cutlery which cannot be Magnetized
« Reply #1 on: 21/06/2007 04:38:38 »
someone gimme a clue pls?
 

Offline Soul Surfer

  • Neilep Level Member
  • ******
  • Posts: 3345
  • keep banging the rocks together
    • View Profile
    • ian kimber's web workspace
Cutlery which cannot be Magnetized
« Reply #2 on: 21/06/2007 10:35:51 »
There is not enough information in the question to give you an answer. 
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8669
  • Thanked: 42 times
    • View Profile
Cutlery which cannot be Magnetized
« Reply #3 on: 21/06/2007 13:51:59 »
Some stainless steel alloys simply aren't magnetic. That might be enough to answer the question.
 

Offline mystikalneon

  • First timers
  • *
  • Posts: 6
    • View Profile
Cutlery which cannot be Magnetized
« Reply #4 on: 21/06/2007 16:24:41 »
hi

oh what i meant was its not stainless steel, lets say theres a spoon, fork and knife side by side, and that u charge the fork with electricity, this will cause the spoon and knife to be magnetized with the handles having reversed polarities. what causes this?

oh and erm what is reversed polarity?

thanks!
matthew
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8669
  • Thanked: 42 times
    • View Profile
Cutlery which cannot be Magnetized
« Reply #5 on: 22/06/2007 14:57:41 »
Have you actually done the experiment? If so how did you charge the fork?
 

lyner

  • Guest
Cutlery which cannot be Magnetized
« Reply #6 on: 24/06/2007 11:55:13 »
There are several 'stainless' steel alloys. The best quality - marine grade, in particular, are  just not magnetic.

Don't confuse electric charge with magnetisation - they are two  different facets of the same phenomenon of electromagnetism. A bit of Yang and Yin.
Quote
arranged in certain orientations
We'd need a lot more detail to have a chance of explaining your original question..
 

Offline mystikalneon

  • First timers
  • *
  • Posts: 6
    • View Profile
Cutlery which cannot be Magnetized
« Reply #7 on: 26/06/2007 12:46:08 »
hm its part of a story my teacher set for the assignment.

the fork is charged by lightning, so i think we can assume that the current flows downwards?

how bout we take the steel as being magnetizable, if lets say the fork is carrying a current, and therefore it generates a magnetic field, how can it make the knife and spoon get reversed polarities?

lets say the spoon, fork and knife are Side by side each other and a magnetic field is generated by the fork. what direction will the field be in and what causes the reverse polarities?
 

Offline daveshorts

  • Moderator
  • Neilep Level Member
  • *****
  • Posts: 2583
  • Physics, Experiments
    • View Profile
    • http://www.chaosscience.org.uk
Cutlery which cannot be Magnetized
« Reply #8 on: 27/06/2007 11:03:08 »
If the fork was sticking in the ground and the current was flowing downwards the magnetic field produced would be circular.


So if you had a knife and spoon lying horizontally on either side they would see the magnetic field in opposite directions, and so get magnetised in opposite directions


I have no idea whether this is the setup your teacher was envisioning. I don't suppose you have a diagram? We have a diagram drawing tool on the forum if you preview your post...
 

lyner

  • Guest
Cutlery which cannot be Magnetized
« Reply #9 on: 27/06/2007 18:14:14 »
Quote
the fork is charged by lightning
It is the current flowing through the fork that will induce the magnetic field - it would be no good if the fork was merely charged up; a stationary charge produced no magnetic field.   A fork sticking up in the ground is hardly going to be insulated.

Daveshort's picture makes sense and explains what the teacher was probably getting at.
In any case, it would certainly spoil a nice picnic!.
 

The Naked Scientists Forum

Cutlery which cannot be Magnetized
« Reply #9 on: 27/06/2007 18:14:14 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums