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Lesson Outcomes for PHY407
TOPIC
LESSON OUTCOMES
10.0: ELECTROSTATICS
At the end of this topic, the student should be able
to:
10.1 Coulomb’s law
REMARKS
a) Explain the concepts of electrons, protons,
charged objects, charged up, gaining charge,
losing charge, grounding and charge conservation
.
b) Describe the motion of point charges when placed  Relate the motion to
near another charged object.
Newton’s 2nd law of motion
and to the concept of
c) Relate the motion of charges to a force and state
motion.

Coulomb’s Law.
qq
 F  k 1 22
where
the
r
d) Explain, qualitatively, how the direction and the
electric
constant
strength of this force changes with magnitude of
1
N
k
 9.0  10 9 2 2
the charges and the distance between the
40
C m
charges.
e) Draw a force diagram to a system of point  2 point charges along the
x-axes, along the y-axes
charges and obtain the direction and magnitude
and 3 charges that forms a
of the resultant force acting on a point charge due
right-angled triangle.
to the presence of other point charges.
HOURS
4
2
TOPIC
10.2 Electric field
LESSON OUTCOMES
REMARKS
a) State qualitative meaning of an electric field

b) Write the electric field strength produced by a
q
 E  k 2 . Note also the
point charge and explain qualitatively how the
r
field strength and direction changes when
direction.
measured at different places.
c) Sketch the electric field lines produced by an  Indicate the change of
isolated point charge, by two positive or two
strength (field intensity) by
negative point charges, by a pair of positivevarying the length of the
negative charge and for a point charge placed
field lines.
between a uniformly-charged parallel plates.
d) Obtain numerically and show pictorially the  Draw the field lines for a
electric field strength and direction for a point
system of 2 positive
charge, for a system of two charges and for a
charges,
2
negative
system of three charges.
charges and a pair of
positive- negative charge.
e) Explain the effect of the electric field on a positive  Numerically determine the
test charge placed at midpoint between a pair of
field intensity on the right,
positive or charges and a pair of positive-negative
on the left and at
charge.
midpoints along the line of
a pair of positive charges
and a pair of positivenegative charge.


qq
 F  q0 E  k 02 .
r
HOURS
2