Physics 2760
Exam 4 review
1. In the circuit shown the emf is 40 V, R = 10 , L = 2 mH and C = 6 F.
Switch S1 is closed, while switch S2 is kept open.
a) What is the voltage across the inductor at the instant switch S1 is
L
closed?
b) What is the current i
Physics 2145 Spring 2016 Test 3 (4 pages)
t , J
Name: $57 but 2; L? is? April 20, 2015 Total Score: / .2 (j) /120_
= qE AV = Ed electron me = 9.11 x 1031 kg e = 1.602 x10'19 C uo=41t><10'7Tm/A
F=CIvBsin9 VF=ILBsin6 B= 3:901 3:0 r=IABsin9
2m" 2R L
2 2
C
Physics 2145 Spring 2016 Test 1 (4 pages)
Name: (:91 1/131; :2! L, February 19, 2016 Total Score: / 221:? /120_
Constants: electron mass me = 9.11 x 1031 kg proton mass rnp = 1.67 X 10'27 kg
e = 1.602 x 1019 C 80 = 8.85 x 1012 CZ/Nm2 k = 9.0 x109 Nm
Physics 2145 Spring 2017 , Test 2 (4 pages)
Name: f6? m 7559 [1 March 15, 2016 Total Score: /Z0 /120_
2
e=l.602x10'19C [=Aq 1:3 R=p5 P=1V=Y=12R
At A R
. 1 1 Q
serles: Req = ZiRi parallel: Req = EiRi C = V
i _ _t _ L _ L
Discharging Q = Q09 RC I = 106 RC
Physics 2145
Name:
Spring 2015
f*irrf:.,
Constants: electron rt&sS lt1e
e:1.6021
1Qre
g
Score:
February 20,2015
Total
:
proton mass mp
eo
9.1i x
1031
:
x
8.85
\
kg
1012
C2Atr.m2 k:
n=119rt
F=eE
.Q
AV
L^A= Kto;
AV_Ed
Yzmu2
AK =
parallel: Crq =LtCt
qA
Physics 2145
\
Name: *i.i.
'
f
P
:
@
= AB cos?
AV=Ed
quB sin?
proton
Test 3@ pages)
Total Score:
mr: 1.67 x 1027 kg
F = ILB sin9
ltol
B = 2iTr
'=l#l
V=lR
B
=ts!
2R
t120
e:1.602 x
1Ore C
B:uol'tt
t=lABsino
L
v2
Vo:4nx1O7TmlA
'R
<t
f . (5) One current lo
Physics 2145
Spring 2016
Name:_solution_
May 10, 2016
Final Exam
(4 pages)
Total Score:_120_/120
Write clearly in the space provided on this Answer Sheet the letter which you believe to be the
best answer to each question found on the following pages. Onl
Physics 2145
Spring 2016
Name:_ March 16, 2016
e = 1.602 x 1019 C
=
series: =
V
parallel:
Discharging
= 0
Charging
= (1
1
=
1
=
)
= 0
= =
2
= 2
=
= 0
(4 pages)
Total Score:_/120_
I=R
Test 2
= 0
= (1
)
_1.(5) A wire has resistance R. What
Physics 2145
Spring 2016
Test 1
(4 pages)
Name:_ February 19, 2016
Total Score:_/120_
Constants: electron mass me = 9.11 x 1031 kg
proton mass mp = 1.67 x 1027 kg
e = 1.602 x 1019 C
k = 9.0 x 109 Nm2/C2
=
1 2
2
0 = 8.85 x 1012 C2/Nm2
=
2
=
=
1 2
Physics 2145 Homework #12: Electromagnetic Induction
1. A 20 cm long metal rod is pulled along two frictionless
conducting rails at constant speed of 5 m/s. The rails have
negligible resistance, and the rod has a resistance of 0.5.
a) Calculate the curren
Physics 2145
Test 1 Preparation Homework
1. Two charges, q1=+1.0nC and and q2=2.5nC are located on the
xaxis as shown in the figure. Charge q1 is located at the origin,
charge q2 at x=+4.0cm. Point P is located on the yaxis at
y=+3.0cm.
a) At point P, d
Physics 2145 Test 3 Preparation Homework
1. Two long wires, perpendicular to the page,
each carry a current of I = 5.25 A in the
directions shown in the diagram.
a) Show the direction of the magnetic field at
point P, due to the current in the lower wire.
Lecture 17: Circuits
Junction law + Loop law
Analyzing circuits
Resistors in series and parallel
Example
Kirchhoffs Laws: Junction Law
Lecture 14:
Current is the same at all points in a currentcarrying wire.
Current is not used up. Charge cannot be creat
Physics 2145
Test 1 Preparation Homework
1. Two charges, q1=+1.0nC and and q2=2.5nC are located on
the xaxis as shown in the figure. Charge q1 is located at the
origin, charge q2 at x=+4.0cm. Point P is located on the yaxis at
y=+3.0cm.
a) At point P, d
Starting Equations
All solutions to homework problems must begin with a starting equation. Show all work.
=R
E=W
Eth=fkx
parallel:
series:
parallel:
P =W/t=Fv
series:
Discharging
(
Charging
)

(
)

(
)
Lecture 15: Ohms Law and Power
=
Ohms Law
Ohmic materials obey Ohms Law
Exceptions: batteries, semiconductors, capacitors, other devices
Current flow through resistor
Assume ideal wires (R=0).
In reality: R wire < R circuit element
Example: flashlight bul
Lecture 9: Capacitors
Capacitors are used to store charge
Charge is directly proportional to potential difference
=
Constant of proportionality: Capacitance
=
Unit: 1 F=1Q/1V Farad
Demos
Capacitance
From lecture 4:
=
From lecture 7:
=
=
=

C
Physics 2145 Test 3 Preparation Homework
1. Two long wires, perpendicular to the page,
each carry a current of I = 5.25 A in the
directions shown in the diagram.
a) Show the direction of the magnetic field at
point P, due to the current in the lower wire.
Physics 2145 Test 2 Preparation Homework
1. A 1m length of wire is made by welding the end of a
60cm silver wire to the end of a 40cm copper wire. Each
piece of wire has a circular crosssection 0.5mm in
diameter. A potential difference of 2V is maintaine
Lecture 14: Current and resistance
Current is motion of charges
Charge carriers in metals are electrons
Current is created by a potential difference due to an
electric field
Electric field is zero inside conductor in static equilibrium.
Now: charges mo
Physics 2145 Homework #11: Magnetic forces and torques
1. In the magnetotron of a microwave oven, the microwaves are produced by having electrons
orbit in a magnetic field. (When the electrons do this, they emit electromagnetic waves which we
will study i
Physics 2145 Test 2 Preparation Homework
1. A 1m length of wire is made by welding the end of a 60cm
silver wire to the end of a 40cm copper wire. Each piece of
wire has a circular crosssection 0.5mm in diameter. A
potential difference of 2V is maintaine
Physics 2145 Homework # 1: Coulombs law, vector review
1. A small glass bead has been charged to +12 nC. A plastic sphere 3cm away from the bead
feels an attractive electric force of magnitude 0.024N. Calculate the charge on the sphere.
2. Two small spher
PHY1220 Spring 2017 Recitation, Feb. 23
1. For each of the 3 situations shown in the figure,
(i) find the magnitude of the torque exerted on the loop about
the vertical axis of rotation. It is given that B = 0.34 T and I =
9.5 A. The loop is a square 0.46
Ryan High
Physics 1220
10/28/15
Lab Report 7: Lenses and Mirrors
During this lab we are looking through convex and concave mirrors and lenses to determine
how distances between these and objects affects the image that is created, whether it is real or
vir
PHY1220 Spring 2017 Recitation March 2
1. The drawing shows that a uniform magnetic field is directed perpendicular into the plane of
the paper and fills the entire region to the left of the y axis. There is no magnetic field to the
right of the y axis. A
PHY1220 Spring 2017 Recitation March 9
1. A 2.0cmhigh object is situated 15.0cm in front of a concave mirror that has a radius of
curvature of 10.0 cm. Using a ray diagram drawn to scale, measure (a) the location and (b) the
height of the image. Verify
PHY1220 Spring 2016 Recitation, Feb. 18
1. Three particles move through a constant magnetic field and follow the
shown in the drawing. Determine whether each particle is positively
charged, negatively charges, or neutral.
paths
2. The drawing shows a top
PHY1220 Spring 2017 Recitation March 16
1. A converging lens of focal length 6.0cm is 12.0cm to the left of a diverging lens of focal length 5.0cm.
A coin is placed 10.0cm to the left of the converging lens. Find (a) the location and (b) the magnificatio