True-false questions are worth 2 points each, three-choice multiple
choice questions are worth 3 points each, five-choice multiple choice
questions are worth 6 points each. The maximum possible score is 92.
The exam period was 75 minutes; the mean score was 55.1 the median was
55. Click here to see page1
page3 of the formula sheet that came
with the exam.
Some helpful information:
• A reminder about prefixes: p (pico) = 10-12; n (nano) =
10-9; μ (micro) = 10-6; m (milli) =
10-3; k (kilo) = 10+3; M or Meg (mega) =
10+6; G or Gig (giga) = 10+9.
(a) When the bulbs are in parallel, they glow more dimly, but
for a longer time than the series.
(b) When the bulbs are in series, they glow dimly and extinguish more
quickly than when in parallel.
(c) In each trial, the same amount of energy is dissipated by the bulbs.
(a) It stays the same because the battery has been removed.
(b) It increases because the charge in the circuit increases.
(c) It increases because the charge on the first capacitor decreases.
A positive charge Q1= +4 μC is located on the
x-axis at x = -4 m. A negative charge Q2
= -12 μC is at the origin (x = 0, y = 0).
What is the y-component of the electric field at y = 5
on the y-axis?
(a) 5000 N/C
(b) -3400 N/C
(c) -3600 N/C
(d) -5000 N/C
(e) -16000 N/C
(a) x = -3 m
(b) x = -2 m
(c) x = -1 m
(a) +0.03 J
(b) -0.03 J
(c) -0.14 J
(d) -0.24 J
(e) -0.48 J
Three charges (Q1 = Q2 = +4 μC,
Q3 = +6 μC) are located at the vertices of an
equilateral triangle of side 70 cm.
What is the magnitude of the force exerted by Q1
and Q2 on Q3?
(a) 0.31 N
(b) 0.44 N
(c) 0.53 N
(d) 0.76 N
(e) 0.88 N
(a) 0.82 J
(b) 1.18 J
(c) 820 J
(d) 180000 J
(e) 257000 J
(a) In this case, the work done to assemble the charges would be
the same as in the previous question.
(b) In this case, the work done to assemble the charges would be the
negative of the previous answer.
In the circuit shown, the battery voltage ε = 20
volts, and the capacitors C1 = 70 μF,
C2 = 30 μF, C3 = 21 μF, and
C4 = 28 μF.
Calculate the total capacitance of this network of capacitors.
(a) 33 μF
(b) 49 μF
(c) 81 μF
(d) 100 μF
(e) 149 μF
(a) 2.94 mJ
(b) 4.2 mJ
(c) 12 mJ
Vwith - Vwithout
(a) -1.9 V
(b) -0.95 V
(d) 0.95 V
(e) 1.9 V
(a) The dielectric in C4 has no effect on the
charge stored in C1.
(b) The dielectric in C4 reduced the charge stored in
(c) The dielectric in C4 increased the charge stored in
In this circuit, you are given R1 = 10 Ω,
R2 = 36 Ω, R3 = 9 Ω,
R4 = 36 Ω and R5 = 10 Ω.
Note the arrows defining the currents I2 and
I4 through resistors through R2 and
R4, respectively. You are not told the battery
True or false: resistors R2 and
R4 are in parallel.
(a) 4.48 Ω
(b) 40 Ω
(c) 60 Ω
(d) 81 Ω
(e) 101 Ω
(a) 60 mA
(b) 80 mA
(c) 100 mA
(d) 125 mA
(e) 167 mA
The circuit shown contains a capacitor which is initially uncharged.
Close switch S at t = 0. What current initially flows into the
(a) 0.133 A
(b) 0.2 A
(c) 0.4 A
(a) 2.4 μC
(b) 4.8 μC
(c) 8.8 μC
(d) 12.1 μC
(e) 13.2 μC
(b) 0.118 A
(c) 0.139 A
(d) 0.177 A
(e) 0.2 A
Is the equation I1 + I2 +
I3 = 0 true or false?