Lecture_12-1 - Lecture 12 1/15 Fundamental Forces in Nature Strong Interaction very strong but very short-ranged acts only over ranges of order

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Lecture 12 1/15 Fundamental Forces in Nature Strong Interaction very strong, but very short-ranged acts only over ranges of order 10 -13 centimeters responsible for holding the nuclei of atoms together is basically attractive, but can be effectively repulsive in some circumstances. Weak Force responsible for radioactive decay and neutrino interactions has a very short range and, as its name indicates, is very weak Gravitational Force is weak Electromagnetic Forces Electric Forces Magnetic Forces
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Lecture 12 2/15 Magnetic Field Permanent magnets: rocks from Magnesia, compass needle, bar magnet, etc. . No net charge no interactions with stationary charges Interactions - among themselves, N-S poles of the earth, with materials such as iron, nickel, tapes, disks, etc. ., moving charges magnetism action at distance like E field magnetic field Define B by interaction with a moving charge q
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Lecture 12 3/15 Magnetic Field Lines Bar magnet two poles: North (N) and South (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 But different from E field lines… B and F B are perpendicular while E and F E are in same direction B field lines do not begin or end while E field lines begin on positive charges and end on negative charges magnetic field lines point from North to South electric dipole bar magnet
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Lecture 12 4/15 More Permanent Magnets and Magnetic Field Lines
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This note was uploaded on 03/14/2012 for the course PHYS 241 taught by Professor Wei during the Summer '08 term at Purdue University-West Lafayette.

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Lecture_12-1 - Lecture 12 1/15 Fundamental Forces in Nature Strong Interaction very strong but very short-ranged acts only over ranges of order

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