1) If a 4-  F capacitor and an 8-  F capacitor are connected in parallel, which has the larger potential difference across it? Which has the larger charge? Quiz 2) Two capacitors are connected in series as shown. If they were initially uncharged, what will be the charge inside the dotted box after connecting points A and B to a battery of voltage V? A B

3) If the wire connecting the capacitors is bent so that capacitors look like A B how do you now call the arrangement?

a b C1C1 C3C3 C5C5 C4C4 C2C2 C 1 =C 5 =8.4  F and C 2 =C 3 =C 4 =4.2  F The applied potential is V ab =220 V. a)What is the equivalent capacitance of the network between points a and b? b) Calculate the charge on each capacitor and the potential difference across each capacitor.

A BC D

Electric field near the surface of a conductor

Capacitors in series: Capacitors in parallel:

Insulating sphere with charge Q uniformly spread throughout the volume A E r A

Conducting sphere with charge Q A E r V r A

Current, Ohm’s Law, Etc.

where R is resistance Resistance does not vary with the applied voltage resistor

Experimentally it is found that R depends on the material the wire is made of and its dimensions. Does not depend on the shape.

+ - V