DC Circuits
EMF Devices
In order to supply a continuous steady current we need a device that can supply a constant
potential difference. Such devices are called EMF devices.
EMF (Electromotive force): The maximum potential difference that can be supplied
Electric Field above an Infinite Uniform Line of Charge
What is the electric field a distance ( R ) above an infinite, uniform line of charge of linear charge density ( ).
Using Coulombs Law
d E
R
r
r^
dQ
x
d E=k
dQ=
dQ
r^
2
r
( QL ) dx=dx r= x + R r^ =co
PHYS 2426: Electric Field
Solutions
7. An atomic nucleus has a charge of +40e. What is the magnitude of the electric field at a
distance of 1.0 m from the nucleus?
E=k
40 e
N
=5.76 108
2
C
(1 m)
8. If the earth's electric field is 100 N/C downward, what m
Kirchhoffs Rules
Kirchhoffs rules apply the concepts of conservation of energy and conservation of
charge to analyze circuits.
Loop Rule: The algebraic sum of potential differences around any simple closed loop
in a circuit must equal zero.
V i=0
i
A sim
PHYS 2426: Electric Charge and Electric Force
Solutions
13.A 10 microcoulomb charge is placed at the origin and a 20 microcoulomb charge is placed
on the x-axis at x = 40 cm. If an electron is placed on the y-axis at y = 30 cm, what is the
magnitude of th
PHYS 2426 Module 1: The Simple Pendulum, Damped Oscillations, and Forced Oscillations
Solutions
6. A simple pendulum of length 2.00 m is used to measure the
acceleration of gravity at the surface of a distant planet. If the period
of such a pendulum is 7.
PHYS 2426: Interference of Sound Waves and the Doppler Effect
Solutions
1. A 0.640-m long gas column is open at both ends. What is the fundamental resonant
frequency of the air column if the speed of sound in the air is 340 m/s?
f 1=
v
=265.6 Hz
2L
2. An
PHYS 2426 Module 1: Acceleration and Velocity as Functions of Position for SHM
Solutions
1. It takes a force of 25 N to stretch a spring 10 cm from its equilibrium position.
What is the spring constant of the spring?
25 N
F
N
F=k
x k=
=
=250
x
0.1 m
m
2.
PHYS 2426 Module 1: Position, Velocity, and Acceleration as Functions of Time for SHM
Solutions
10. A mass of 0.5 kg connected to a spring of spring constant 25 N/m undergoes simple harmonic
motion with an amplitude of 10 cm. If the mass is at its amplitu
PHYS 2426: Speed, Power, Reflection, and Interference of Waves
Solutions
11. Waves travel along a 100-m length of string with a mass of 55 g, which is held taut
by a tension of 75 N. What is the speed of the waves?
v=
T
=
(
75 N
m
=369
s
0.055 kg
100 m
)
PHYS 2426: Electric Potential
Solutions
3. At a certain point in space the electric potential is 20 V. A 4.0-C charge is brought
from infinity to that point. What is the electric potential energy of this charge at
that point?
U=qV =80 J
4. The voltage bet
PHYS 2426: Gausss Law
Solutions
1. If a closed surface surrounds a dipole, the net flux through the surface is zero. TRUE
2. Gauss's law can be applied using any surface. FALSE (only CLOSED surfaces)
3. If the electric flux through a rectangular area is 5
Lab 6: Work-Energy Theorem: W=
E
Jessica Mata
University Physics 2325/101
Group Members: Kenia Chapa, Ethan Schooley, Macy Valdez
Data Tables:
Item
Trial 1
Mass (hanging)
150 g
Mass (cart and sensor)
848.7 g
Maximum Velocity
1.26
1.32
Maximum Kinetic Ener
GEN ED ASSESSMENT: MATH 2414
Question4:
a. The most efficient calculation done would have to be with respect of dx.
This is because it only made you to do one simple long calculation versus
two separate ones.
b. I believe that respect of dy was more chall
Consider the electric field created by q in
the animation. The electric field vector at
some point P:
1.
2.
3.
4.
always points in the same direction as
the force vector on a positive test
charge placed at P.
always points in the opposite direction
as the
Determined is defined as having made a firm decision and being resolved not to change it. Being an
individual who has had to work for everything they have and accomplished is why I describe myself as
determined. My entire life I have always been that outg
Lab 6: Work-Energy Theorem: W=
E
Jessica Mata
University Physics 2325/101
Group Members: Kenia Chapa, Ethan Schooley, Macy Valdez
Data Tables:
Item
Trial 1
Mass (hanging)
150 g
Mass (cart and sensor)
848.7 g
Maximum Velocity
1.26
1.32
Maximum Kinetic Ener
Set the left charge to +1 and the right
charge to -1. What is the electric field at
the midpoint between the two charges?
1.
2.
3.
4.
Zero.
Non-zero directed to the
left.
Non-zero directed to the
right.
Non-zero directed
vertically upward.
Click here to p
Ch.4 Elasticity
What is Elasticity?
Elasticity- is a measure of how much consumers and producers will respond to change in market
conditions
Concept can be applied to supply or demand, and it can be used to measure responses to a change in
the price of a
COP
Chapter 13
=m/V
F
P
A
F1 F2
A1 A2
QL
W
Entropy in a natural
process
S 0
squeezed, changing its V from .
020m3 to .018m3. During this
process the temp decreases by 9K
while the pressure incre by
450pa. What was the original
pressure and temp of the ga
DC MOTORS
EVERYDAY DC MOTORS
Household appliances
Fans
Printers
Microwaves
MORE EXAMPLES
TRANSPORTATI
ON
Segways
Hoverboards
Hybrid Electric
Vehicles
Also
In newer model cars,
hydraulic power steering
assist is being replaced with
electric power a
Module 1 Exam Formula Sheet
Constants
Fundamental electric charge:
19
e=1.6 10
2
9 Nm
Coulombs Constant: k =9 10
C2
C
C Plate = 0
A
d
1
Energy Stored :U capcaitor = Q V
2
Permittivity of Free Space:
0 =8.85 1012
C2
N m2
Coulombs Law
( magnitude ) F=k
|q 1
PHYS 2426: Wave Motion
Solutions
7. A wave has a period 2.00 s, an amplitude 20.0 cm, and a wavelength 3.00 m. What is
the speed of the wave?
f =v v=( 0.5 Hz ) ( 3 m )=1.5
m
s
8. The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.