Why do permanent magnets have a magnetic field? Why doesn't Mars have a magnetic field? Why does the Earth's magnetic field reverse? Why do magnets lose their magnetism? Why does a piece of iron in a current-carrying loop increase the magnetic field strength?
Invented in the early 1980s, neodymium magnets are, as of 2009, the strongest kind of permanent magnet available. Their strength, small size and low cost have made numerous advances in personal audio, electric motors and other areas possible. Neodymium magnets are made of an alloy called NIB–...
What makes Magnets Magnetic? All matter is made up of atoms. Atoms in turn, are made up of protons, electrons and neutrons. In most materials almost all the electrons form pairs, with the magnetism from the two paired electrons exactly cancelling. This makes such materials non-magnetic. What...
Physicists have some understanding of how magnets function. However, some phenomena that underlie magnetism continue to elude scientific explanation. Exactly how do magnets work? Large-scale magnetism, like the kind observed in bar magnets, results from magnetic fields that naturally radiate from the ...
They come in two different tubes, one containing the synthetic resin and the other containing a chemical that makes the resin harden. The two chemicals are useless by themselves but, mixed together, form a tough, permanent adhesive.Photo: 1) Stick adhesives are solvent-free and very safe to ...
a) By how many percent is the torque of a motor decreased if its permanent magnets lose 5.0% of their strength? b) How many percent would the current need to be increased to return the torque to original values? Name the few methods of increasing friction. Explain about induced and reduce...
All permanent magnets are surrounded by magnetic field. True False All permanent magnets are surrounded by a magnetic field. True False Explain whether the following statement is true or false for two oppositely charged, isolated parallel plates. (Note: Isolated plates ca...