#  Electrostatics 

 



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###  Triboelectric Effects

 \[M | t | ★★★\]  
Ebonite rod/fur, or glass rod/silk, to generate static charges.  
\[[In-Depth Description](/presentations/triboelectric-effects)\]

###  Induced Electric Dipole

 \[M | t | ★★\]  
Neutral Styrofoam puffs are attracted and picked up by charged rod.  
\[[In-Depth Description](/presentations/induced-electric-dipole)\]

###  Polarization of Two Spheres

 \[M | t | ★★★\]  
Two neutral metal spheres become oppositely charged in the presence of a charged object.

###  Electroscope

 \[S/M | t | ★★★★\]  
Gold leaf projection or large arm balance versions of qualitative electrometers.  
\[[In-Depth Description](/presentations/electroscope)\]

###  Conservation of Charge to 3 Sig Figs

 \[M | t+ | ★★★\]  
A neutral system of charges is rearranged...charge measured on rabbit's fur is equal and opposite to the charge on the teflon, which has been rubbed with the fur.  
\[[In-Depth Description](/presentations/conservation-charge-3-sig-figs)\]

###  Conservation of Charge to 2 Sig Figs

 \[M | t+ | ★★★\]  
A neutral system of charges is rearranged...charge measured on a fleece sweater is equal and opposite to the charge on a silk shirt, which has been in contact with the fleece.  
\[[In-Depth Description](/presentations/conservation-charge-2-sig-figs)\]

###  Coulomb's Law

 \[L | t+ | —\] Charged, helium-filled balloons repel and/or attract each other.  
\[S | t | —\] A small apparatus also shows the effect more quantitatively.

###  Hair Raising

 \[M | t | ★★★★\]  
Wig or hippy volunteer, use a Van de Graaff generator to make your hair repulsive.  
\[[In-Depth Description](/presentations/hair-raising)\]

###  Electrostatic Bells

 \[S | t | —\]  
Electically charged bells are repeatedly struck by a small ball which is alternately attracted and repelled by them.

###  Electrostatic Motor

 \[M | t+ | —\]  
Ping-pong ball oscillates inside parallel plate capacitor.

###  Wimshurst Machine

 \[M | t | —\]  
Antique electrostatic generator.  
\[[In-Depth Description](/presentations/wimshurst-machine)\]

###  Kelvin Water Dropper

 \[M | t+| —\]  
Unique electrostatic generator...Purcell's analog of Wimshurst.

###  Van de Graaff Generator

 \[L | t+ | —\]  
Anti-antique electrostatic generator to be used with pie plates, etc. or just as a demonstration by itself (of static electricity generation).

###  Contact Us

 **Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu