spheres & shells, circles & annular rings
The image in the left panel can be thought of as a -
- BLUE circle surrounded by a GREEN annulus,
or the equator of a -
- BLUE sphere surrounded by a GREEN spherical shell.
You can vary the thickness of the [annulus,shell] by dragging the yellow dot.
How do the curves in the right panel vary with the ratio of the radii?
What questions could/would you put to your students base on this applet?