Lecture 2
Ch-24
Gausss Law
Lecture Plan
1. Introduction
2. Definition of Electric Flux: Qualitative and
Quantitative Definitions.
3. Flux through a closed surface
4. Definition of Gausss Law
5. Application of Gausss Law
Introduction
We learned how we cal
Activity P52: LRC Circuit
Equipment:
Voltage Sensor
Patch Cords
1
2
Multimeter
1
AC/DC Electronics Lab
(100 F capacitor; 10 resistor; Inductor
Coil; Iron core; 5 inch wire lead)
The purpose of this activity is to study resonance in an inductor-resistor-ca
Measurement of Resistance
A Wheatstone Bridge network will be used to measure the resistance of several conductors
individually and in series and parallel. The conductors will be composed of different metals, have
different lengths, and have different dia
Activity P50: RC Circuit
Equipment:
Voltage Sensor
1
AC/DC Electronics Lab
(330 F capacitor; 100 resistor)
LCR Meter
Patch Cords
1
2
When a DC voltage source is connected across an uncharged capacitor, the rate at which the
capacitor charges up decreases
Activity P30: Induction Magnet through a Coil
Equipment:
Voltage Sensor
1
Bar Magnet
1
AC/DC Electronics Lab
1
When electricity is passed through a conducting wire a magnetic field can be detected near the wire.
Micheal Faraday was one of the first scient
Ohm's Law
Equipment:
RLC Circuit Board
1
Patch Cords
2
Ohm discovered that when the voltage (potential difference) across a resistor changes, the current
through the resistor changes. He expressed this as
V
I
R
where I is current, V is voltage (potential
DIFFRACTION GRATING
Equipment:
Helium-Neon Laser
Diffraction Grating
Stands and clamps
1
2
6
Mercury vapor lamp
Meter stick
1
4
A diffraction grating may be used to produce spectra so that the wavelengths of the light may
be measured. The grating consists
KIRCHHOFFS LAWS
Simple electrical networks, involving only
resistors and a single voltage source, can
usually be solved (often by inspection alone) by
network reduction schemes: replacing parallel
and series combinations with their equivalent
resistance.
RC Circuit Lab
Genovy Cabrera
Physics 1302. 102
Partners: John Mai, Emily Almaguer, Vivian Nguyen
DATA:
Time to half-max (t1/2)
= 0.024 s
Capacitance = 3.46E-4 F
= 346 F
(Remember,
), where R = 100 ohms
C
t1
2
ln2
R
Percent Difference between stated capac
Vectors Lab: Addition of Vectors
The apparatus used in this experiment (see Fig.) consists
of a horizontal force table graduated in degrees and provided
with pulleys that may be set at any desired angles. A string
passing over each pulley supports a weigh
LAB REPORT INSTRUCTIONS
Laboratory work is intended to supplement and reinforce physical principles covered in
lecture. It provides the student hands-on experience, which facilitates understanding of key
concepts.
I. Lab work is a group effort. The number
Measurements
Part 1: Density of metal cylinder
1. Dimensions of the cylinder:
Length, l = _ _ _ _ _ mm = _ _ _ _ _cm = = _ _ _ _ _ m
Diameter, d= _ _ _ _ _ mm = _ _ _ _ _cm = = _ _ _ _ _ m
2. Measure the mass of the cylinder, m= _ _ _ _ _ _ _ g = _ _ _ _
Phys 1401, SJCD, Summer 2017, Ex-l, Dr. Gandhi
Name SOLUT I Q cfw_315
SHOW YOUR WORK FOR EACH PROBLEM T0 EARN FULL CREDIT.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) 0.00325 X 10-8 cm can al
Sow-now
1401, Ex-Z, SJCD, Summer 2017, Dr. Gandhi
Name
SHW YOUR WORK T0 EARN FULL CREDIT
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) An object' IS moving with constant velocity 1n a straight li
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
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 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
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
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
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
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
DC MOTORS
EVERYDAY DC MOTORS
Household appliances
Fans
Printers
Microwaves
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TRANSPORTATI
ON
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Vehicles
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In newer model cars,
hydraulic power steering
assist is being replaced with
electric power a