E 1:  Study the default case of the twin vortices. Calculate rotation and divergence yourself by partial derivation of the formulas of the components (the "other" coordinate is treated as a constant).

E 2:  Change the scale with the zoom slider and observe how the visual impression of the field changes with scale.

E 3:  Start the test object and follow its path concerning direction and velocity. Try to understand this by studying the formulas.

E 4:  Draw the test object to other points in the field and test its quantitative structure by the object´s movement.

E 5:  Choose fields that have constants as components. Change numbers and understand how this influences the field. Start the test object. Does it change its velocity?

E 6: Choose fields with components linear in coordinates. Try to understand the context. Why are divergences not quoted?  (localized limits may occur at sources).

E 6:  How does the test object move now? Which terms in the formulas lead to acceleration?

E 7: Choose the two corresponding last cases of twin sources and twin vortices and study the differences.

E 8: Invent your own formulas for fields, calculate divergence and rotation, describe the characteristics.