Field just outside a long solenoid

被引：23

作者：

Farley, J ^{[1
]}

Price, RH ^{[1
]}

机构：

[1] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

来源：

AMERICAN JOURNAL OF PHYSICS | 2001年 / 69卷 / 07期

关键词：

D O I：

10.1119/1.1362694

中图分类号：

G40 [教育学];

学科分类号：

040101 ; 120403 ;

摘要：

Simple lessons about static magnetic fields are often taught with the model of an "infinite" solenoid, outside of which the fields vanish. Just outside a very long but finite solenoid of length L, the field must be a decreasing function of L. We show that this external field is approximately uniform and decreases as L-2. Furthermore, we show that the study of this external field provides interesting and surprisingly simple illustrations of techniques for analyzing magnetic fields. (C) 2001 American Association of Physics Teachers.

引用

页码：751 / 754

页数：4