Lecture 8: Div(ergence) S Consider vector field and Flux (c.f. fluid flow of Lecture 6) of out of S rate of flow of material (in kg s -1 ) out of S For.

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Presentation transcript:

Lecture 8: Div(ergence) S Consider vector field and Flux (c.f. fluid flow of Lecture 6) of out of S rate of flow of material (in kg s -1 ) out of S For many vector fields, e.g. incompressible fluid velocity fields, constant fields and magnetic fields Fluid density outside inside But sometimes and we define div(ergence) for these cases by A scalar giving flux/unit volume (in s -1 ) out of e.g, if is the fluid velocity (in m s -1 ),

In Cartesians 1 dx 2 AxAx dxdx Consider tiny volume with sides dx, dy, dz so that varies linearly across it Consider opposite areas 1 and 2 for just these two areas = Similar contributions from other pairs of surfaces

Simple Examples

Graphical Representation where brightness encodes value of scalar function

Physics Examples Incompressible (  = constant) fluid with velocity field because for any closed surface as much fluid flows out as flows in Constant field since for any closed surface Compressible (   constant) fluid:  can change if material flows out/in of dV mass leaving dV per unit time A continuity equation: “density drops if stuff flows out”

Lines of Force Sometimes represent vector fields by lines of force Direction of lines is direction of Density of lines measures 1 2 larger at 1 than 2 Note that div ( ) is the rate of creation of field lines, not whether they are diverging If these field lines all close, then 1 e.g. for magnetic field lines, there are no magnetic monopoles that could create field lines Electric field lines begin and end on charges: sources in dV yield positive divergence sinks in dV yield negative divergence -Q +Q

“Charge density drops if charges flow out of dV” (continuity equation) Maxwell’s Equations link properties of particles (charge) to properties of fields In quantum mechanics, similar continuity equations emerge from the Schrödinger Equation in which  becomes the probability density of a particle being in a given volume and becomes a probability current Further Physics Examples (s -1 ) charge density (C m -3 ) volume (m 3 ) current density (A m -2 ) surface (m 2 ) drift velocity field charge of current carrier number density (m -3 ) of charges