## Classical theory of electricity and magnetism: a course of lectures |

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Page 88

Relation between magnetic moment and angular

system The angular

linear

current ...

Relation between magnetic moment and angular

**momentum**for a classicalsystem The angular

**momentum**is defined as L = J(rxp)d\> (18) where p is thelinear

**momentum**density vector at the point r. If we suppose that both the electriccurrent ...

Page 122

This term is independent of the existence of charges or currents and is

nonvanishing even in vacuum provided the flux of electromagnetic energy exists.

We interpret it in the following manner — the part causes a

matter ...

This term is independent of the existence of charges or currents and is

nonvanishing even in vacuum provided the flux of electromagnetic energy exists.

We interpret it in the following manner — the part causes a

**momentum**change ofmatter ...

Page 123

The pressure of radiation As the radiation field carries

absorbed or scattered (reflection is also a case of scattering) by a material

obstacle, there will be a

will thus ...

The pressure of radiation As the radiation field carries

**momentum**, if it isabsorbed or scattered (reflection is also a case of scattering) by a material

obstacle, there will be a

**momentum**transfer from the field to the obstacle whichwill thus ...

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### Contents

The empirical basis of electrostatics | 1 |

Direct calculation of fields | 7 |

dipoles9 The Dirac 5function13 | 13 |

Copyright | |

23 other sections not shown

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acceleration angle angular axis boundary conditions calculate called centre charge density charge distribution charged particle coefficient coil components conducting conductor consider coordinates dielectric constant differential dipole direction distance divergence electric and magnetic electric field electromagnetic field electromotive force electron electrostatic energy flux equation 16 expression field due field point finite fluid formula Fourier frame frequency function given gives Hence incident infinite interaction isotropic Laplace's equation linear Lorentz transformation magnetic field magnitude Maxwell's equations medium molecule momentum motion number density obtain orthogonal oscillations permanent magnets perpendicular photon plane plasma point charge polarization potential due Poynting vector radiation field radiation reaction radius refractive index region relation result satisfied scalar shows sin2 solution special theory sphere at infinity spherical surface integral symmetry tensor term theorem theory of relativity transverse uniform vanishes vector potential velocity volume wave length write zero