Wednesday, March 6, 2013

em01 Lorentz force the fields exert influence


For a given dependence

D[E],H[B] (and given boundary conditions, see below) the Maxwell


equations uniquely specify the fields in terms of the charges. Reciprocally, the fields exert influence

on the charge distribution. Responsible for this feedback mechanism is the
Lorentz force (density)

http://www.thp.uni-koeln.de/alexal/pdf/electrodynamics.pdf

Consequence of the mutual influence of fields on matter: a new understanding of

forces

between particles

. Newtonian mechanics: the interaction between two (charged) particles A and B is

instantaneous

; contradiction with the principle of relativity, i.e. the existence of a maximal speed of

signal propagation (the velocity of light), see below. In ED, the interaction between

A and B is mediated

by a field: the charge of particle

A creates an electromagnetic field (via the Maxwell equations) which

then influences

B (via the Lorentz force.) This indirect interaction is retarded (by the speed of field

propagation which will turn out to be the speed of light.) History: the experimentally observed forces

between charges could not be understood in terms of an instantaneous Newtonian interaction and

required

the introduction of non–matter fields into our description of nature. Modern physics describes all four

fundamental iqnteractions as indirect processes matter

$ (gauge) field $ matter.

Indeed, we will see that ED is compatible with the principles of special relativity

No comments:

Post a Comment