Physics Demonstrations at Cal Poly Pomona
Demo Index:
Pira Index:
Title:
Description:
Demonstrates the relationship between the density of the e-field and the radius of a sphere.
Equipment:
1. Pasco Van de Graaff
2. Point & sphere assemby w/ strings
3. 1/2" PVC pipe for vertical support
4. Telescope clamp & wood block
Procedure:
1. By hand cranking the Van de Graaff, charge the sphere and point assembly.
2. When you stop charging, the charge quickly begins to drain off through the string attached to the Van de Graaff. Note which, the point strings or the sphere strings, retain charge by watching the collapsing of the strings attached to each. (The sphere with its large radius loses charge more rapidly than the point.)
