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5B20.17 - Flux Surface Windsock Model

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​5B20.17 - Flux Surface Windsock Model

Title5B20.17 - Flux Surface Windsock Model

This is a windsock surface to demonstrate how flux work on complicated surfaces.

Assembly Instructions

​No assembly required.  Just grab items out of storage. One large wind sock, one small wind sock. 

Setup Time1
Operation Time5
Preview Time1
Operation Instructions

Gauss’s Law: You can use the windsock to illustrate flux through different surfaces.

Ampere-Maxwell Law: illustrate different surfaces (flat disk vs. bulging windsock) (surfaces over which to integrate current density) that are bounded by the same path (the metal ring around which to integrate the line integral of B)​
Demo on DimeYes
PIRA 200No
Export Instructions (if different)

The electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity.  Flux = Q_enc/epsilon_o​

In electromagnetism, flux is a scalar quantity, defined as the surface integral of the component of a vector field perpendicular to the surface at each point.  The surface has to be orientable, to differentiate between positive and negative flow.  The surface normal is directed by the right-hand rule.  Flux lines originate from areas of positive divergence and end at areas of negative divergence.

Electric flux is useful in association with Gauss' law.  The electric flux through a planar area is defined as the electric field times the component of the area perpendicular to the field.  Other surfaces you would use the area integral since the angle will be continually changing.  Flux = EAcos(theta)

Category5 Electricity and Magnetism
Subcategory5B - Electric Fields and Potential
Keywordsflux, windsock
Construction Information
flux surface windsock model
Export-sized flux surface windsock model