6. Pith Ball Electroscope
The ball is able to swing in any and all directions in
response to nearby charges.
7. Metal Leaf Electroscope
2) A metal leaf electroscope is a vertical conductive
rod with a metal ball on top and 2 thin sheets of
loose metal attached at the bottom.
9. Metal Leaf Electroscope
If a charge contacts the touch ball then both leaves will
receive this charge and move apart.
+- ---
-+ ---
-
Neutral Charged
11. Needle Electroscope
3) A needle electroscope has a touch ball attached to a
conductive bar that bends. There is a pivoted free-swinging
needle on either side of (going through) this bar.
13. Needle Electroscope
If a charge contacts the touch ball then the bar and
needle will become the same charge as the rod (by
conduction) and will swivel away.
---
-+-
-- +--
Neutral Charged