Lec13-5 - Lecture 13-1 READING QUIZ 1 Which of the...

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Lecture 13-1 READING QUIZ 1 Which of the following statements is incorrect when a particle with charge q and mass m travels with a velocity v perpendictular to a uniform magnetic field ? A| The charged particle undergoes a centripetal acceleration. B| The force on the charged particle acts at right angles to the the magnetic field. C| The force on the charged particle acts at a right angle to the particles velocity. D| The magnetic force changes the speed of the charged particle. E| The charged particle travels in a circular path.
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Lecture 13-2 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 weak, Electromagnetic forces : – Electric forces – Magnetic forces
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Lecture 13-3 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
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Lecture 13-4 Magnetic Field Lines Bar magnet . .. two poles: N and S Like poles repel; Unlike poles attract.
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This note was uploaded on 04/23/2011 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue University-West Lafayette.

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Lec13-5 - Lecture 13-1 READING QUIZ 1 Which of the...

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