Thursday, April 24, 2008

Went over Relativity test results.

Started electrostatics with introductory lecture. Showed demos using electroscopes.

Charge an ebonite rod by rubbing it with fur (charge by friction). This rubs electrons off the fur and onto the rod.
Bringing the charged rod near the electroscope causes the leaves to spread (like charges repel).

Charge the electroscope by contact.

Now bringing the charged rod close to the electroscope causes the leafs to spread further apart.

Bring the fur (positive charge) near the electroscope causes the leafs to fall back.

Drew pictures showing charges.

Demonstrated and showed with pictures charging by induction.

Demoed the pith balls.
Demoed polarization of charge by attracting a stream of water using both negatively and positively charged strips.

Handed out electrostatics mini-labs. Students tried various activities including the Van De Graff.

Collected RA 21.1, RA 21.2.
Handed out RA 21.3 for homework.