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

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Page 100

motipn of the closed coil itself. The important thing was that the current in the

closed coil lasted only as long as the flux was changing. More quantitatively, the

i.e. ...

motipn of the closed coil itself. The important thing was that the current in the

closed coil lasted only as long as the flux was changing. More quantitatively, the

**electromotive force**in the coil was found to be given by the rate of change of fluxi.e. ...

Page 110

/0C (growth) (decay) The case of an alternating impressed

We shall assume the impressed

with time — in a sense this docs not involve any loss of generality for any periodic

...

/0C (growth) (decay) The case of an alternating impressed

**electromotive force**We shall assume the impressed

**electromotive force**to be sinusoidally varyingwith time — in a sense this docs not involve any loss of generality for any periodic

...

Page 111

2 _ = Z (18) which is called the impedance of the circuit and the current, which is

of the same period as the

The simple case where there is no capacitor may be considered a little further.

2 _ = Z (18) which is called the impedance of the circuit and the current, which is

of the same period as the

**electromotive force**, lags in phase by tan"1 [7.(0- — |//? .The simple case where there is no capacitor may be considered a little further.

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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