Homework 3
Due in lecture on Wednesday, February I] , 2015
Problem with Circuit #1
Find the equivalent resistance of the circuit in the
picture, and then the current I through resistor R1.
its? _,
' a) Calculate the equivalent resistance Heq (this is the equivalent resistance to replace all
a
J, . u
c) Now go back to the full circuit in the gure. Use Kirchoffs laws to write down one
node equati
Homework 1
Gravitational and electric force 7
A positron is exactly the same thing as an electron, but it carriers a positive unit charge instead of
a negative unit charge. To answer the following que
Homework 7
L Due in lecture on Wednesday, March 18, 2015
Problem with unpolarized light
A unpolarized light beam passes through a Polaroid lter emerging fromthe lter with an inten
sity of 20W/m2. What
Problem 3
An object and two lenses are arranged as given in the picture below where you can read all the
information you need to solve the problem,
lanai Ism#2
fi=20m f1=~4nm
a) With ray tracing, nd
Problem 6 X'Vmr
The picture below represents the angular dependence of the intensity of the interference prole
of light of wavelength 800nm that went through a grating.
Waves
Examples.
Transverse waves:
 an oscillating cello string
 light, or any electromagnetic wave
 ripples in a pond after a stone
falls vertically in
 an iron bar hit with a hammer vertically
do
Wave Propagation
Wave model versus ray model of light:
The wave model considers light to be a wave propagating through space. Diffraction and
interference are important. The ray model considers light
Homework 10
Problem with Huygens Principle
Using Huygens Principle, nd the wave fronts of the incoming wave at points A and B.
QA: relive wcwcb 414m: :5;
Q : Yodivs coaxial; cl i
'3 l5
Problem With
Homework 9
Representing a sinusoidal wave #1
A sinusoidal wave has a wavelength of 1.5m and a velocity of 2m/s. At F05 and x=0, the me
dium is at its equilibrium position, y=0, and the displacement is
. Homework 4
g I  _ Due m lecture on Wednesday, February 18, 2015
Flying particle
v A particle with mass m=0.2g is negatively chargedrvvith a charge q=108C. It is initially shot in a
horizontal dire
Homework 5
3 Three parallel wires with different currents in different directions
Three parallel Wires lie in a plane as shown in the picture. The
separation between adjacent Wires, and the Wire curr
Problem 1
Charge Q1 = 2Q and charge Q2 = + Q are placed at points (x = O, y = +a) and (x = + a, y = 0),
respectively. Q = 1 yC, a = 2 m.
a) At point P, nd the electric eld E1 from charge Q1, and the
557 T i i4
Problem 4 ' 4L0 
My, T'F, instead of movmg the loop out of the magnetic eld region, we rotate it around a rotation axis
A square current loop of side length 2a=0.06m carries ' along the x
Problem 3
A square current loop (side length 2a) carrying a current I = 1 A has one corner inside a region
(shadowed area in the picture) with an homogenous magnetic eld of 0.1 T, pointing into the
pa
Hour Exam 2
Physics I 3 a Spring Semester 2015
Wednesday, April 8, 2015
8:10am9:00am
Students name:
1. This is a closed book test. No books of any kind are allowed.
2. You are allowed to have
Hour Exam 1
Physics I 3 ~ Spring Semester 2015
Wednesday, February 25, 2015
8:10am9:00am
Students name:
1. This is a closed book test. No books of any kind are allowed.
2. You are allowed to ha
Hour Exam 2
Physics 13
B=O,5T
g , 69
Problem 1 ,) A
5
, The square copper loop in the gure has a side of length 3cm and a
resistance of SQ. The magnetic eld B is into the page and is decreas V V
Physics 13
M
+
= 0.03C
i
Problem 1 via
qz +0.06C J? . . 5 m .
TWO pOint Charges q2=q4=40iclarc placed on the xaxis,  *1fi;i;t~13   .>
and tWO Pomt Charges qr=q3=O.05(are placed on the yaxi
Hour Exam 1
Physics 13
y

5m
q1 = 0.03C
Problem 1
5m
Point P
5m
+
q4 = +0.06C
5m
Two point charges q2=q4=+6C are placed on the xaxis,
and two point charges q1=q3=3C are placed on the yaxis
as sho
Hour Exam 2
Physics 13
Problem 1
The square copper loop in the figure has a side of length 3cm and a
resistance of 5. The magnetic field B is into the page and is decreasing its intensity at a rate of
Problem 1
A wave is moving on a string in the positive x direction at a velocity of 600m/s. The amplitude of
the wave is of 0.1cm, and the wavelength is 5th.
a) What is the frequency of the wave?
wel
Problem 3
In air (n1=l), an initially unpolarized light beam is reected on a polycarbonate surface
(n2=l.5 85) so that it is prepared in a state with polarization perpendicular to the horizontal (per
Homework 8
Problem with Reection and Refraction
Consider a light beam of wavelength X2400nm coming from air (index of refraction
n=1) and hitting a glass block with index of refraction n=1.55 as shown
Homework 6
.17; Problem with an inductor
,.,::;n
The current in a coil is increased uniformly from zero to 5A in 10s, the selfinduced EMF is 15V.
a) How large is the inductance of the coil?
s 30%
Homework 5
Due in lecture on Monday, February 27, 2017
I2 = 3A
4 cm
wire 2
wire 1
2 cm
wire 3
Three parallel wires lie in a plane as shown in the picture. The
separation between adjacent wires, and th
Homework 4
Due in lecture on Monday, February 20, 2017
close switch
Problem with capacitors discharging and charging
When the switch is closed at t=0s, the capacitors in the figure are charged.
40
25
SOLUTION Homework 5
Three parallel wires with different currents in different directions
I2 = 3A
I3 = 13A
Three parallel wires lie in a plane as shown in the picture. The separation between adjacent
w
Homework 6
Due in lecture on Monday, March 6, 2017
Problem on Gausss Law #1
Calculate the net electric flux through the cylinder.
q3 = 6C
q2 = 3C

+

+
q1 = 2C
q4 = 10C
q5 = 7C

q6 = 10C
+
Probl
Homework 5
Due in lecture on Monday, February 27, 2017
I2 = 3A
4 cm
wire 2
wire 1
2 cm
wire 3
Three parallel wires lie in a plane as shown in the picture. The
separation between adjacent wires, and th