Moving pointlike charges and electric and magnetic dipoles
作者:
Marijan Ribarič,
Luka Šušteršič,
期刊:
American Journal of Physics
(AIP Available online 1992)
卷期:
Volume 60,
issue 6
页码: 513-519
ISSN:0002-9505
年代: 1992
DOI:10.1119/1.16865
出版商: American Association of Physics Teachers
关键词: CHARGED PARTICLES;ELECTRIC DIPOLES;MAGNETIC DIPOLES;CURRENT DENSITY;CHARGE DENSITY;ELECTROMAGNETIC FIELDS;LORENTZ FORCE;TORQUE;POWER;ENERGY CONVERSION;RELATIVISTIC RANGE;ELECTRIC MOTORS;ELECTRODYNAMICS;INTEGRALS;MAXWELL EQUATIONS
数据来源: AIP
摘要:
Expansions of the volume integrals of strongly localized, continuous, differentiable electric charge and current densities are introduced in terms of the total charge, and variable and moving electric and magnetic dipoles, and conditions under which such expansions are applicable are determined. To enhance an understanding of the effects of external electromagnetic fields acting on very localized densities of electric charges and currents, the resulting Lorentz force, torque, and power are computed by using such expansions. To show how versatile variable and moving dipoles are for building physical models, the following are considered: (a) energy conversions by electric motors, by dielectric and induction heating, and by the magnetic drag force, and (b) relativistic effects in translational movements of steady electric and magnetic dipoles; in particular, the torque on a magnetic dipole moving parallel to a line carrying a steady current and uniformly distributed electric charges.
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