TITLE : ELECTRICITY AND MAGNETISM
CODE : AP250
CREDIT VALUE : 3
LEVEL : II
PRE-REQUISITE : Nil
RECOMMENDED BACKGROUND KNOWLEDGE :
•
•
•
E in HKALE Physics or Engineering Science, or HKALE (AS-Level) Physics and
E in HKCEE Additional Mathematics, or C in HKCEE Mathematics; or
Equivalent of the above.
KEYWORDS : Electrostatics: electric fields in matter, dielectrics; magnetostatics: magnetic
fields in matter, magnets; electromagnetic induction; energy in electric and
magnetic fields.
AIM
The aim of the subject is to introduce the basic concepts in electricity and magnetism, and to
formulate the laws in vector language.
LEARNING OUTCOMES
Category A
Professional/academic knowledge and skills
On completing the subject, students will be able to:
SA1
use methods in vector analysis to formulate laws and relationships in Electricity and
Magnetism, and to solve problems,
SA2
solve problems in electrostatics using Coulomb’s Law, Gauss’ Law, and Image
Method for cases involving simple charge distributions,
SA3
specify the dielectric properties of linear isotropic materials and to solve problems
involving dielectrics,
SA4
determine the magnetic field due to simple current distributions using Biot-Savart
Law and Ampere’s Circuital Law, and solve problems involving the interaction
between moving charge (or current) and magnetic field using Lorentz Law,
SA5
describe the characteristics of different types of magnetic materials and solve
problems in magnetic circuits,
SA6
determine the induced emf arising from changing magnetic field and moving
circuits,
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SA7
interpret polarization and magnetization using simple microscopic models, and
SA8
apply the knowledge in Electricity and Magnetism to appliances, devices, and other
real life problems.
Category B
Attributes for all-roundedness
On completing the subject, students are expected to be better trained/educated/prepared in the
acquisition of the following skills/attributes:
SB1
be able to identify the given conditions of a problem and suggest or provide
solutions to the problem,
SB2
be able to present arguments and provide explanations clearly in English, and
SB3
be aware of the importance of foundation knowledge in life-long learning and in
self-learning.
SYLLABUS
v
Electrostatic field and potential : Coulomb’s law, electrostatic field E , Gauss’ law and
applications, electrostatic potential, field and potential gradient, electric dipole field, force
and torque on dipole, image charge.
v
P
Electrostatics of dielectrics
:
polarization
, polarization charge densities, Gauss’ law in
v
v
termsv of displacement D , susceptibility and dielectric coefficient, boundary conditions for D
and E .
v
Magnetic field of steady currents : magnetic induction B and Lorentz law, force on current
element, force and torque on circuit, Biot-Savart law, Ampere’s circuital law, magnetic
dipole field, force and torque on dipole, Gauss’ law of magnetism.
Electromagnetic induction : magnetic flux, motional emf, Faraday’s law, Lenz’s law, change
of flux and charge through circuit, search coil, eddy currents.
v
Magnetic properties of materials : Amperian current, magnetization M ,
current densities, Ampere’s circuital law in terms of magnetic intensity
susceptibility and permeability, paramagnetic and diamagnetic materials,
materials, hysteresis loop, soft and hard magnetic materials, magnetic circuits.
magnetization
v
H , magnetic
ferromagnetic
Energy in electric and magnetic fields : Electrostatic energy of charge distributions, energy
density of electric field, energy density of magnetic field, hysteresis loss, force and torque by
energy method.
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AP250
MODE OF STUDY
Lecture
Tutorial
Total
35 hours
7 hours
42 hours
ASSESSMENT WEIGHTING
Coursework (30%)
Written Tests
Assignments
Examination (70%)
15%
15%
Written Examination
Total
70%
100%
To pass the subject, students must obtain grade D or above in the examination.
LIST OF REFERENCES
Duffin, W J
Electricity and Magnetism
McGraw Hill
1990
Cheng, D K
Fundamentals of Engineering Electromagnetics
Addison-Wesley
1993
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