How will a magnet behave if cut in a spherical shape?...will it attract or repel?
485205
a magnet by definition is a LINEAR entity consisting of 2 opposite ends ( north and south ).\n\nif you cut a rectangular magnet into a smaller sphere, that linear axis in the original magnet will still stay the same in the sphere !\n\nmagnets ALWAYS have a linear alignment no matter there exterior shape !
1097908
Iron, cobalt and nickel can be magnetic. They can be made to have polarity. Poles that are alike repel and poles which are not alike attract. A magnet will attract all of them if they are not polarized. If they are polarized, a magnet will attract or repel according to the polarity.\n;-D
177391
No\n\nThe reason this has\nnever happened is due to the source of magnetic fields:  moving electric\ncharges.  When electric charges (e.g. electrons) move in circles, they\nproduce a magnetic field.  In a piece of iron, it is very easy to line up\nthese circles, getting all the little magnets to work together as one big\nmagnet.\n\nFor each of these circles, one side is the north pole and one side is the\nsouth pole.  Since each circle has two sides, each circle has a north and a\nsouth pole.  Even the smallest possible magnets (spinning electrons) have a\nnorth and a south pole.
512643
ferromagnet materials will lose their magnetism if heated above a point known as the Curie temperature. \nExposure to an opposing magnetic field will "knock it down", but not demagnetize it completely.
363907
For dia magnetic substances the permeabilities are slightly less than unity. Hence the field is hardly affected.\n\nIf a diamagnetic needle is placed in a nonuniform magnetic field it will be repelled.\n\nIn uniform field the needle turns perpendicular to the flux line.\n\nInside a solenoid the magnetic field is uniform. The position of dipoles are such that the external magnetic field is not affected much.
478897
Yes if sufficient force is applied the force of impact will negate the magnetism. This is because the charged particles (electrons, neutrons, protons) will collide and confuse the flow of energy. Unless you have an elctromagnet then the magnetism will survive.\n\nSometimes if you drop a compass you will also make it useless as they are also magnetic
1097043
Sorry, but as far as I can tell, it doesn't exist.\n\nThen again, I know nothing about this area of interest.\nI like enio_giacomini's answer. Go with that.\nThen again, he answered that "magnet" question with "In center," which makes no sense at all.  Whatever. Your call.
991087
Depends, if the attraction force of the magnet is bigger then the force of friction of the disc with the oil combined with the force necessary to break the surface tension. The weight and size of the disk are also very important.
1045884
http://en.wikipedia.org/wiki/Magnets\n\ngo there if u wanna find out, i only know simple version...
1072982
a)It is already a magnet. It can not become an electromagnet.\nb)Can not happen\nc)If this happens it will only be for a short period\nd)After a long time its power may be reduced but not lost completely\n\nSo I can not tell for sure. Mots likely c
1090476
Iron (like steel and certain alloys) contains atomic magnets or dipoles which can line up their 'magnetic axes' in a preferred direction.  In the magnetized state, all the magnetic axes will point in one specific direction, by which the iron filling will show polarity and hence be a magnet itself.\nWhen you heat the iron fillings, the high temperature makes the atoms to vibrate with increasing energy and this disturbs the dipoles and so the resultant magnetic axes point in their 'preferred' random directions, which keep changing due to the extra energy. If the iron fillings were magnetized before heating, all the magnetism would be lost. Magnetizing them after heating will not align the vigorously vibrating atomic magnets and rapidly changing magnetic axes.
856083
Why do magnets work? \nMagnetism is an invisible force felt within the space around a magnet.  This space, called the magnetic field, can either attract (pull) or repel (push away) other magnets and some types of metal.\n\nAll magnets have two ends (poles).  These poles are opposites and are called the north and south poles.  Opposite poles attract, while like (similar) poles, repel.\n\nThe Earth’s core has its own magnetic field.  Magnetic north and south are near the geographic north and south poles.\n\nNASA has been experimenting with magnetic fluids for over 30 years. Magnetic fluids were made to help put fuel into a rocket engine. NASA was trying to solve the problem. of how to move fuel without gravity.  Tiny pieces of iron were put into the fuel. A magnet pulls the iron and could help get the fuel into the engine.\n\nMagnetic fluids are made by mixing pieces of metal in liquids to make a fluid that is very different from other liquids. It will stick to a magnet and can be directed by magnetic forces. Magnetic fields can shape the fluid, and magnetic fluids can change their thickness. They become hard around magnets.\n\nScientists have tried to use magnetic fluids to solve other problems. They’re used to make better computers. Scientists are still thinking of new ways to use the fluids.\n\nYou may use magnetic fluids!  Some cars have them in their shock absorbers. They are used in some buildings and bridges. The fluids help protect structures from damage from earthquakes or strong winds. There is still a lot to learn about these magnetic fluids. NASA is using the Space Station to learn more about them. They hope to find new ways to use them. \n\nKSNN thanks NASAexplores as a source of information. For more information about this topic and additional teaching resources go to http://www.nasaexplores.com
253070
Around any magnet there is a magnetic field.  The magnetic lines of force start from North Pole of a magnet and go around the magnet and ends in the South Pole.\n\nIf any isolated unit North Pole placed in that field will go round the magnet along a line of force in the direction of North Pole to South Pole and reach the South Pole.\n\nA unit South Pole will move in opposite direction.\n\nTherefore if another magnet is placed near it, its north pole tend to go along the line of force i.e. from North Pole to South Pole whereas the South Pole moves toward the North Pole on the opposite direction. \nThis is the mechanism of repulsion.
907372
A magnet whose magnetic properties is dependent on current flow.
214806
If the magnet was not strong enough to actually magnetize the knife blade, then no harm has been done.  If the knife blade does have a magnetic field on it, then it can possibly pick up very small particles of iron when it is used.  These are very small iron filings.  They may be almost too small to see with just the naked eyeball (without using a magnifying glass).\n\nIf the blade is used with iron filings on the blade, it will tend to become dull faster than if it is used without these.  As long as the blade is occasionally and carefully wiped with an oiled rag, this will remove the iron and no harm will be done.
519039
It really depends.  if you are trying to pass current through the magnet, hooking up the N pole to the + side of the battery, and the S pole to the - side of the battery, then nothing much, other than the magnet may heat up a bit.\n\nIf you are wrapping a copper coil around the magnet and then passing current through the coil, then depending on which way the current is flowing, and how strong a current you are using, you'll either make the magnet stronger, or make the magnet weaker.
250947
maybe using a magnet will help