Hwk7B - PHYS 153 Term 2, 2008-09 Homework 7B Mar. 9 - 13...

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PHYS 153 Term 2, 2008-09 Homework 7B Mar. 9 - 13 Problem 1 Quark Model of the Neutron. The neutron is a particle with zero charge. Nonetheless, it has a nonzero magnetic moment with z -component 9 . 66 × 10 - 27 A · m 2 . This can be explained by the internal structure of the neutron. A substantial body of evidence indicates that a neutron is composed of three fundamental particles called quarks : An “up” ( u ) quark, of charge +2 e/ 3, and two “down” ( d ) quarks, each of charge - e/ 3. The combination of the three quarks produces a net charge of 2 e/ 3 - e/ 3 - e/ 3 = 0. Fi the quarks are in motion, they can produce a nonzero magnetic moment. As a very simple model, suppose the u quark moves in a counterclockwise circular path and the d quarks move in a clockwise circular path, all of radius r and all with the same speed v . (a) determine the current due to the circulation of the u quark. (b) Determine the magnitude of the magnetic moment due to the circulating u quark. (c) Determine the magnitude of the magnetic moment of the
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Hwk7B - PHYS 153 Term 2, 2008-09 Homework 7B Mar. 9 - 13...

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