Lec13-5 - cture 13- cture 13- 1 Fundamental forces in...

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Unformatted text preview: cture 13- cture 13- 1 Fundamental forces in nature The strong interaction is very strong, but very short- ranged. It acts only over ranges of order 10-13 centimeters and is responsible for holding the nuclei of atoms together. It is basically attractive, but can be effectively repulsive in some circumstances. The weak force is responsible for radioactive decay and neutrino interactions. It has a very short range and, as its name indicates, it is very weak. The gravitational force is even weaker. Electromagnetic forces : Electric forces Magnetic forces cture 13- cture 13- 2 Magnetic Field Permanent magnets: rocks from Magnesia, compass needle, bar magnet, No net charge no interactions with stationary charges Interactions- among themselves, N-S poles of the earth, with materials such as iron, nickle, tapes, disks, moving charges magnetism action at distance like E Define B by interaction with a moving charge q magnetic field cture 13- cture 13- 3 Magnetic Field Lines Bar magnet ... two poles: N and S Like poles repel; Unlike poles attract. Magnetic Field lines : (defined from the direction and density of B similarly to the electric field lines are from E ) From North to South outside electric dipole No sources or sinks cture 13- cture 13- 4 More Permanent Magnets and Magnetic Field Lines cture 13- cture 13- 5 BAR MAGNETS AND IRON FILINGS 6A01 cture 13- cture 13- 6 Magnetic Monopoles How can you isolate this magnetic charge? Try cutting a bar magnet in half. In fact no attempt has been successful in finding magnetic monopoles in nature....
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Lec13-5 - cture 13- cture 13- 1 Fundamental forces in...

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