Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up.
What non-metal is attracted by a magnet?
Are there any non-metal objects that are attracted by magnets?
Mark Eichenlaub
FranklinFranklin
$\begingroup$ Ferrite? en.wikipedia.org/wiki/Ferrite_%28magnet%29 $\endgroup$
– Solomon Slow
Oxygen, for one. In its gaseous state it moves too fast to be affected, but liquid oxygen can be trapped between the poles of a magnet:
Materials can be broadly classified into three sets:
Diamagnetism: All materials are diamagnetic, but their diamagnetic propoerties are easily masked by paramagnetic/ferromagnetic nature. Diamagnetism is the property of an object to be weakly repelled by all magnetic fields. doesn't matter if its near a north or south pole. It will always be repelled. With stronger magnets, the "weakly" becomes less weak, and we get levitating frogs:
Yup, that's a live frog, but more importantly(except to the frog I guess), he's diamagnetic. And he floats in the magnetic field--poor chap must be confounded.
Paramagnetism This is basically the opposite of diamagnetism. Paramagnetism is the property of a material to be attracted towards a magnetic field--again, it doesn't matter north or south. The strength of the attraction varies widely, but its always greater than the diamagnetic repulsion, and generally much less than ferromagnetic attraction. Paramagnetism is only observed in materials with unpaired electrons. Oxygen is paramagnetic (so is diatomic boron), so its attracted by the magnetic field. Note that not all metals are paramagnetic--in fact many are just plain diamagnetic materials (not sure of this)
Ferromagnetism: This is the property of a material to get permanently magnetised. Only a few elements are ferromagnetic (iron, cobalt,nickel, neodymium, and a few others). These are generally strongly attracted to a magnetic field.
iBug
ManishearthManishearth
$\begingroup$ +1 for the frog. I wonder if I could levitate a graduate student. I think in the interests of science the experiment has to be tried. $\endgroup$
– John Rennie
$\begingroup$ @John :) Seriously though, it seems that they have done mice and are trying to do humans to test effcts of microgravity &c. $\endgroup$
$\begingroup$ Thanks for the information. I believe "Liquid Oxygen" would be a good example. However, this question was asked by a teacher to a student of the 2nd grade. How do you explain "Liquid Oxygen" ? Anyways, thanks for the answers!! $\endgroup$
– Franklin
$\begingroup$ @Franklin: Same way that you explain how water has three phases. Just say that if its cold enough, oxygen can be made into a liquid--just how water can be made to go from steam-->water-->ice. Like I said, gaseous oxygen is also pulled towards a magnet, but the molecules move to fast and mask this effect. Otherwise, I have examples of compounds (not single-element-molecules) that are affected-- $\rm NO_2$ is one. $\endgroup$
$\begingroup$ There is also iron oxides and other compounds some of which are ferromagnetic, and non metallic. $\endgroup$
– Dmytry
There are many non metals attracted to magnets. Oxygen is an example, which is demonstrated in this youtube video. The property of being attracted to a magnet is called paramagnetism if you'd like to search for more about it.
BebopButUnsteadyBebopButUnsteady
Sticking to ferromagnetism, http://en.wikipedia.org/wiki/Ferromagnetism#Ferromagnetic_materials has a list of ferromagnetic materials. Several metal oxides are ferromagnetic - I don't know if you'd consider these to be non-metals.
Interestingly, the article claims that a lithium gas can be made ferromagnetic, though this seems a bit esoteric, and I don't know if it would actually be attracted to a magnet.
John RennieJohn Rennie
In the presence of magnetic fields, the non-magnetic material magnetize. There are three types of magnetization: ferromagnetism, paramagnetism and diamagnetism. The most interesting example is ferromagnetism. Non-magnetized iron (latine ferrum) is composed of small domains - domains are little parts of material that act like small magnets, but since domains' magnetic fields are oriented in different directions, net magnetism of non-magnetized iron bar is about zero. In presence of magnetic field, these domains align themselves in the direction of outer magnetic field, therefore, non-magnetized material becomes itself a little magnet. And two magnets attract each other with opposite poles.
PygmalionPygmalion
Some of the diamagnetic materials are Superconductor,Pyrolytic carbon,Bismuth,Mercury,Silver some of the paramagnetic metals are Aluminium,Lithium,Magnesium,Sodium
Dinesh NeelakandanDinesh Neelakandan
Magnetic field is always generated by moving charges. Two primary reasons for magnetic field generation are due to motion of an electron around nucleus and rotation of an electron around it's own axis which is called spin. If we take any atom and place it inside of a magnetic field it will interact with it due magnetic field generated by motion of electrons. The strength and type of interaction depends on the electronic shell structure.
Nikolay FrickNikolay Frick
$\begingroup$ This does not appear to answer the question $\endgroup$
– Sean
Not the answer you're looking for? Browse other questions tagged electromagnetism or ask your own question.
Why does magnet attract iron but not other metals?
Does magnetism only work on ferrous objects?
Are metals more heavy due to the Earth's magnetic field?
Is an electron attracted to one of the magnetic poles in this scenario?
How is magnetism ''conducted'' through a non-magnetic metal?
How does a force get transmitted when a magnet attracts iron?
How to attract liquid metal with magnets?
Is there a type of magnet that will only attract one type of metal?
Force on a ferromagnetic material attracted by a magnet
Why electrons are attracted from a magnetic field?