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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 02/03/2010 for the course PHYS PHYS 153 taught by Professor Billmcutcheon during the Spring '09 term at UBC.

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online