Overview of static electricity( On Electric Force , field and, Electric potential, capacitance and dielectrics).

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Chapter 1

• Overview of static electricity( On Electric Force
  , field and, Electric potential, capacitance and
  dielectrics).
• http//www.fayoum.edu.eg/nmhE-Mail
  nmh00_at_fayoum.edu.eg

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Faculty of Computers And Information Fayoum
university Physics 1 Gen 125 Electricity and
Magnetism REF Physics For Scientists And
Engineers 6E By Serway And Jewett   Content Ch.
1-1 Overview of static electricity( on Electric
field, Electric potential, capacitance and
dielectrics).(ch24-ch25-ch26)  
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Physics 1 Gen 125 ElectricityREF Physics
For Scientists And Engineers 6E By Serway And
Jewett

• Ch. 1 Overview of static electricity( on
  Electric field, Electric potential, capacitance
  and dielectrics).(ch24-ch25-ch26)
• Ch. 2 Resistance and current
• (Ch 27 in serway)
• 2-1 Electric Current
• 2-2 Resistance
• 2-3 A Model for Electrical Conduction
• 2-4 Electrical Power

• Ch. 3 - Direct current and circuit
• (Ch 28 in serway)
• 3 -1 Electromotive Force
• 3 -2 Resistors in Series and Parallel
• 3 -3 Kirchhoffs Rules
• 3 -4 RC Circuits
• 3 -5 Electrical Meters
•  
• Inductance Self learning
• Ch32 in serway)

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Physics 1 Gen 125 Electricity Ref Physics
For Scientists And Engineers 6E By Serway And
Jewett

• Ch. 4 AC circuits
• (Ch 33 in serway)
• 4.1 AC Sources
• 4.2 Resistors in an AC Circuit
• 4.3 Inductors in an AC Circuit
• 4.4 Capacitors in an AC Circuit
• 4.5 The RLC Series Circuit

• 4.6 Power in an AC Circuit
• 4.7 Resonance in a Series RLC Circuit
• 4.8 The Transformer and Power Transmission
• 4.9 Rectifiers and Filters

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• The aim of the course
• The graduates have to develop a clear
  understanding of the basic concepts of
  electricity and electronics .
• Developing the graduate's skills and creative
  thought needed to meet new trends in science.
• Supplying graduates with basic attacks and
  strategies for solving problems.

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- Intended Learning Outcomes - Intended Learning Outcomes
A- Knowledge and Understanding Concept of electric field, electric flux k electric potential and capacitance. Concept Dc circuits and Ac circuits. 3) Investigate the characteristics of simple series circuits that contain resistors, inductors, and capacitors and that are driven by a sinusoidal voltage. 4) Strategies for solving problems related to the previous topics.
B- Intellectual Skills Utilizations of theories, rules and basic sciences to interpret physical events. Collecting information from its relevant sources and use it in discussion.
C- Professional and Practical Skills Being able to solve problem sheets related to the material course. Collect and record data and information from libraries and summarize it in suitable forms. The student would be able to apply some experiments related to the course contents.
D- General and transferable Skills Graduate should be able to access data and information from the Internet related to the course subjects. Graduate should develop self professional, scientific, and personal attitude towards continuous education. Graduate should be able to cooperate in teams
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Chapter 1 Electric Charge and Electric Fields
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Electric Charge Types Two types of
charges Positive Lack of electrons Negative
surplus of electrons Unit Coulomb C
- -

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Coulombs Law
K 8.89 x109Nm2/C2


r
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Coulombs Law
(N)
?o- Another constant called permittivity of
vacuum
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Coulombs Law Several Charges
y
F
q
F
1
13
F
13
F
q
23
2
X
q
3
F
23
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Electric Field Force acting on a unit positive
charge at the point.
q

(N/C)
r
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Electric Field Force acting on a unit positive
charge at the point.
q

(N/C)
r
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Lines of Force Point Charge
-

negative
positive
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Lines of Force Dipole
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Lines of Force Two positive charges
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Lines of Force Charged plane
q
-q
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Lines of Force Two charged plates
q
-q
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More Coulombs Law
q1
q2
Coulombs constant
permittivity of free space
Charge polarity Same sign Force is
right Opposite sign Force is Left
Electrostatics --- Charges must be at rest!
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Superposition of Forces
Q1
Q2
Q0
Q3
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Zero Resultant Force, Example
q1 15.0 mC

• Where is the resultant force equal to zero?
• The magnitudes of the individual forces will be
  equal
• Directions will be opposite
• Will result in a quadratic
• Choose the root that gives the forces in opposite
  directions

q2 6.0 mC
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Electrical Force with Other Forces, Example

• The spheres are in equilibrium
• Since they are separated, they exert a repulsive
  force on each other
• Charges are like charges
• Proceed as usual with equilibrium problems,
  noting one force is an electrical force

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Electrical Force with Other Forces, Example cont.

• The free body diagram includes the components of
  the tension, the electrical force, and the weight
• Solve for q
• You cannot determine the sign of q, only that
  they both have same sign

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More Field Lines
Surface Charge Density
Volume Charge Density
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Superposition of Fields
q1
q2
P
q3
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Superposition Example

• Find the electric field due to q1, E1
• Find the electric field due to q2, E2
• E E1 E2
• Remember, the fields add as vectors
• The direction of the individual fields is the
  direction of the force on a positive test charge

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Electric potential,

• Potential difference in uniform electric field.
• Electric potential point charge.

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Electric Potential Energy

• Electrical potential energy is the energy
  contained in a configuration of charges. Like all
  potential energies, when it goes up the
  configuration is less stable when it goes down,
  the configuration is more stable.
• The unit is the Joule.

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Potential difference and electric potential

• The potential difference ?V VB - VA between two
  points A and B in an electric field is defined as
  the change in potential energy of the system when
  a test charge is moved between the points divided
  by the test charge qo

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• The electric potential is a measure of potential
  energy per unit charge, the SI unit of both
  electric potential and potential difference is
  joules per coulomb, which is defined as a volt (V)

that the SI unit of electric field (N/C) can also
be expressed in volts per meter
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Electric Field and Electric Potential

• E - V / d
• Two things about E and V
• The electric field points in the direction of
  decreasing electric potential.
• The electric field is always perpendicular to the
  equipotential surface.

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Summary

• Coulombs law states that the electric force
  exerted by a charge q1 on a second charge q2 is
• The electric field E at some point in space is
  defined as the electric force Fe that acts on a
  small positive test charge placed at that point
  divided by the magnitude q0 of the test charge

The potential difference ?V VB - VA between two
points A and B in an electric field is defined as
the change in potential energy of the system when
a test charge is moved between the points divided
by the test charge qo
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