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Unformatted text preview: 1. (10 points)
Four capacitors are connected to a battery as shown below.
a) What is the equivalent capacitance of the four capacitors?
b) How much charge ﬂowed out of the battery?
0) What is the charge on each capacitor? (1) What is the potential difference Vab? ééﬂ v 100.0 V
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2”" frat; awry" Q/“i k :‘afh “‘ ﬂ 2. (10 points) a) Find the current in the 6.00 9 resistor.
b) Find the unknown emfs V1 and V2.
_ c) Find the unknown resistance R. A “(the A“ V5? r; dgg n x} {Pm} g4: 9“" 53m»; A" WE’JQQA“ it“ ’3 {3 “Q v VL 1: i?,@0$ﬁ {vaﬁw‘ﬁﬁwﬂg “a? a)» ,1, {Kiev —~ {(“WQ; A” “3g5gv =2 Q R i: “it if 1:2 J L 3. (10 points) The top of a Van de Graaff generator can be approximated as a metal sphere of radius 10.0
cm. Suppose it is charged to a potential of 1.00 x 105 volts. Assume it can be treated as
an isolated sphere at that potential. a) What is the total charge on the sphere, surface charge density, and electric ﬁeld
just outside the surface of the'sphere? b) Plot the magnitude of the electric ﬁeld as a function of radius from the center
of the sphere out to a few times the sphere radius — label the axes properly,
with values and units. ‘ c) Plot the electric potential as a function of radius from the center of the sphere
out to a few times the sphere radius — label the axes properly, with values and units
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 Fall '08
 Smith,D
 Electric charge, Van de Graaff, sphere radius

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