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 99.
The exam period was 90 minutes; the average score was 85.2; the median
score was 88. Click here to see page1
page2 of the formula sheet that came
with the exam.
The switch is initially open and the capacitor initially carries a
charge Q0 = +10 μC on the top plate and
-Q0 on the bottom plate. At t = 0 the switch
What is the maximum current Imax in this LC
circuit? (Note: 1 mA = 10-3 A)
(a) Imax = 1 mA
(b) Imax = 5 mA
(c) Imax = 8 mA
(d) Imax = 10 mA
(e) Imax = 12 mA
(a) t1 = 6.15 ms
(b) t1 = 12.57 ms
(c) t1 = 9.36 ms
(d) t1 = 3.14 ms
(e) t1 = 1.48 ms
(a) dI / dt = 1.3 A/s
(b) dI / dt = 2.0 A/s
(c) dI / dt = 5.0 A/s
The current as a function of time is shown in the right- hand
Which one of the following graphs best describes the voltage across the
inductor VL(t) = VB -
VA as a function of time?
(b) remains the same.
At what frequency f = ω / 2π is
(a) 0 Hz
(b) 3.55 × 10-5 Hz
(c) 712 Hz
(d) 4.47 × 103 Hz
(e) 3.18 × 106 Hz
(c) is in phase with.
(a) ω > ωo
(b) ω < ωo
(c) ω = ωo
What is the rms power provided to the circuit?
(a) <P(t)> = 330 W
(b) <P(t)> = 450 W
(c) <P(t)> = 570 W
(d) <P(t)> = 621 W
(e) <P(t)> = 660 W
(a) E0 = 27.5 V/m and B0 = 9.2 × 10-8 T
(b) E0 = 1 V/m and B0 = 3 × 10-9 T
(c) E0 = 1 V/m and B0 = 1 T
(d) E0 = 13.7 V/m and B0 = 17.6 T
(e) E0 = 34.3 V/m and B0 = 1.1 × 10-7 T
The primary coil of an ideal transformer is connected to an AC
voltage source as shown in the figure below. There are 100 turns in the
primary coil and 20 turns in the secondary coil.
If the voltage drop measured across the resistor is
V2 = 50 V, what is the voltage provided by the AC
(a) V1 = 10 V
(b) V1 = 50 V
(c) V1 = 250 V
A beam of light, initially polarized along the y-axis, passes
through a linear polarizer and then through a quarter wave plate,
aligned as shown in the diagram.
What is the polarization state of the light that emerges from the
quarter wave plate?
(a) circularly polarized
(b) linearly polarized at 45°
(c) linearly polarized at -45°
(a) I2 = 0
(b) I2 = I
(c) I2 = I / 2
(d) I2 = I / 4
(e) I2 = I / √2
A plane electromagnetic wave propagates in vacuum. The figure below
represents a snapshot at time t = 0 of the electric field
associated with this wave, which is described by E =
E0 sin(ωt-kx) y with
E0 = 1000 V/m. The frequency is f = 300 kHz.
Points P and Q are along the x-axis.
Which one of the following options correctly relates
BP, the magnitude of the magnetic field at point P at
time t = 0, to BQ, the magnitude of the
magnetic field at point Q at time t = 0?
(a) BP = BQ = 0
(b) BP > BQ = 0
(c) BP = BQ > 0
(a) λ = 0.1 m
(b) λ = 1.0 m
(c) λ = 100 m
(d) λ = 1000 m
(e) λ = 10000 m
A beam of unpolarized light of intensity I0 travels
in the +z-direction and goes through an arrangement of three
linear polarizers as shown in the figure below. The planes of all
polarizers are parallel to the xy plane.
Find the ratio between the final intensity If and
initial intensity I0.
(a) If / I0 = 0.16
(b) If / I0 = 0.28
(c) If / I0 = 0.38
(d) If / I0 = 0.42
(e) If / I0 = 0.75
(b) remain the same.
(a) 9 μJ
(b) 16 μJ
(c) 18 μJ
(d) 25 μJ
(e) 32 μJ
A person is driving in such a way that a red (600 nm) light appears
to be green (500 nm).
How fast is the person driving?
(a) 2.7 × 107 m/s
(b) 5.4 × 107 m/s
(c) 1.6 × 109 m/s
(a) toward the light.
(b) away from the light.