Is it possible to make a spherical magnet?
340754
You can order magnetic balls on-line- so the answer is pretty obviously 'yes'.
896989
You can make a ball bearing launcher:\nhttp://my.execpc.com/~rhoadley/maglnch.htm\n\nYou can make your own levitating MagLev train:\nhttp://my.execpc.com/~rhoadley/magtrain.htm\n\nOther info is available here:\nhttp://www.kn.sbc.com/wired/fil/pages/listmagnetsan1.html
564016
A magnet consists of molecular magnets.\nIf these magnets are arranged uniformly then the magnet will be stronger.\nIn an ordinary piece of iron there are molecular magnets, but since they are irregularly arranged there is no net magnetic field created.
991385
Experimenting with magnetorheological fluids.\nSuspending a magnet in mid-air.\nLevitating pyrolytic graphite.\nA Gauss Rifle: A Magnetic Linear Accelerator.\nBuilding a Curie-effect heat engine.\nGoing further:\n\nSuperconductors.\n\n \n \n \nThe Gauss Rifle:\nA Magnetic Linear Accelerator\n \n \n This very simple toy uses a magnetic chain reaction to launch a steel marble at a target at high speed. The toy is very simple to build, going together in minutes, and is very simple to understand and explain, and yet fascinating to watch and to use.  \n \n gauss rifle Click on image for animated view  \n \n The photo above shows six frames of video showing the gauss rifle in action. Each frame shows 1/30th of a second. In the first frame, a steel ball starts rolling towards a magnet taped to a wooden ruler. In the second frame, a second ball can be seen speeding between the rightmost two magnets. By the third frame, the accelerator has sped up so much that the ball that is seen leaving the left side of the device is just a blur as it smashes into the target. One ball, starting at rest, has caused another ball to leave the device at a very high speed.  \n \n gauss rifle materials Click on image for larger view  \n \n The materials are simple. We need a wooden ruler that has a groove in the top in which a steel ball can roll easily. Any piece of wood or aluminum or brass with a groove will work. We chose the ruler because they are easy to find around the house or at school or at a local stationery store.  \n \n We need some sticky tape. Again, almost any kind will do. Here we use Scotch brand transparent tape, but vinyl electrical tape works just as well.  \n \n We need four magnets. Most any type will do, but the stronger the magnets are, the faster the balls will go. Here we use the super strong gold-plated neodymium-iron-boron magnets we have made available in our catalog for the other projects. They work great.  \n \n We will also need nine steel balls, with a diameter that is a close match to the height of the magnets. We use 5/8 inch diameter nickel plated steel balls from our catalog.  \n \n The only tool we will need is a sharp knife for trimming the tape.  \n \n gauss rifle first\nClick on image for larger view  \n \n We start by taping the first magnet to the ruler at the 2.5 inch mark. The distance is somewhat arbitrary -- we wanted to get all four magnets on a one foot ruler. Feel free to experiment with the spacing later.  \n \n gauss rifle tape\nClick on image for larger view  \n \n With the sharp knife, trim off any excess tape. Be careful, since the knife will be strongly attracted to the magnet.  \n \n It is very important that you keep the magnets from jumping together. They are made of a brittle sintered material that shatters like a ceramic. Tape the ruler to the table temporarily, so that it doesn't jump up to the next magnet as you tape the second magnet to the ruler.  \n \n gauss rifle two\nClick on image for larger view  \n \n Continue taping the magnets to the ruler, leaving 2.5 inches between the magnets.  \n \n When all four magnets are taped to the ruler, it is time to load the gauss rifle with the balls.  \n \n gauss rifle all\nClick on image for larger view  \n \n To the right of each magnet, place two steel balls. Arrange a target to the right of the device, so the ball does not roll down the street and get lost.  \n \n To fire the gauss rifle, set a steel ball in the groove to the left of the leftmost magnet. Let the ball go. If it is close enough to the magnet, it will start rolling by itself, and hit the magnet.  \n \n gauss rifle ready\nClick on image for larger view  \n \n When the gauss rifle fires, it will happen too fast to see. The ball on the right will shoot away from the gun, and hit the target with considerable force. Our one foot long version is designed so the speed is not enough to hurt someone, and you can use your hand or foot as a target.
304336
No there is no substance which can block magnetism except another magnet.  You can block electromagnetic energy quite easily depending on the strength.
199857
A large magnet will do the trick.
744142
Attract..mmm...TRY A MAGNET !!
1005047
this would work only over short distances.  the problem is that gravity decreases as one over the square of the distance, while magnetism decreases as one over the cube of the distance.  thus, magnetism would get weaker faster than gravity.  also, magnetic field structures tend to be much more complex than gravitational fields.  you would have to understand the magnetic field of the planet extremely well for it to be of use for something like this.
695795
Did this way back in Boy Scouts....Relatively easy...just need to build 2 electromagnets and a series circuit..... I'll see if instructions are online.\nhttp://www.terrax.org/comm/morsecode/buzzer2.aspx\nhttp://chss3.montclair.edu/~pererat/perbuild.htm\nthe second one is similar to what I built
91154
If there are charges on the sphere, then the moving charges will produce a magnetic field. This is called the Biot-Savart law.
997877
that's sweet here i think is a link for a patent. I was thinking on how to make something like that, accelerating itself but i failed :P another of my questions was proven wrong leading me to the conclusion it is impossible for magnets to be used in mine.\n\nhttp://www.inventhelp.com/contactform_patent.asp?id=106&wcw=overture&GCID=S17330x002&KEYWORD=patent+office&MATCHTYPE=search
856860
You would need to have the magnet moving, and the power it would take to make it move would be more than any advantage you get out of it. Laws of Thermodynamics.
764447
It depends on how powerful a magnet you use. To get a magnet to perform all of those tasks, it will need to be a really powerful one.
609714
Take a compass and a bar magnet and let them trace the field lines. Or better yet, take a piece of paper with metal shaving on it, then place a magnet underneath. The shaving will align with the field lines. Pretty cool.
949073
http://www.scitoys.com/scitoys/scitoys/magnets/gauss.html\n\nAll the details, tips, and materials you will need. I had great fun experimenting with my first one, making it longer, adding more magnets, larger magnets and bearings etc. I managed to get hold of some great magnets and bearings the same size as a pool ball. \n\nI won't go into detail about what happened to my bedroom wall with that one though, it's another story.\n\nHope you like the site and have fun.\n\nPete.
1123749
Hey there:\n\nInteresting question, because a month ago, i stumbled upon a thrown away harddrive while walking my dog.  I desembled it while I was at home, and found inside it TWO EXTREMELY POWERFULL RARE EARTH MAGNETS.  Also, around on each side of these magnets, was a magnetic shield, that did not allow them to attract from one side, but yes from the other.  If I was you, look for any thrown away harddrive, they all have them, and you will also be getting an extremly powerfull magnet while you are at it.
1045884
http://en.wikipedia.org/wiki/Magnets\n\ngo there if u wanna find out, i only know simple version...