# Coulomb`s Law Practice

advertisement ```Topic
Date
Page #
Seed Question
Coulomb’s Law Practice
Exploration
1.
L-level
complete 1– 6.
kC = Coulomb’s constant = 9 x 10
2
9 𝑁∙𝑚
CLASS SET
𝐶2
Two charged particles are separated by a distance of 12 meters. The
Coulomb force between them is 20 N. What will the Coulomb force be if the
same particles are separated by a distance of 6 meters? Draw force diagrams
showing the magnitude and direction of forces on both particles at 12 meters
and at 6 meters.
2.
K-level
complete 4–10.
3.
4.
5.
6.
7.
Two particles are 15 meters apart. Particle A has a charge of 5.0 • 10−4
C, and particle B has a charge of 4.0 • 10−4 C. The resulting Coulomb
force is:
Two charges exert a force of 4.0 N on each other when separated by 1.0
m. Indicate the magnitude of the force when:
a. the separation is doubled
b. the separation is reduced by &frac12;, explain
c. the magnitude of one charge is reduced by &frac12;
d. the magnitude of both charges are doubled
A young woman (m=55 kg) accumulates a charge of +2 x 10-5 C while
sliding out of the front seat of her car. Her boyfriend (m = 80 kg) has
been waiting in the wind and has gained electrons. He now has a charge
of –8 x 10 –5 C. Calculate the magnitude of the electrical force the
woman exerts on her boyfriend when they are 0.5 m apart.
Sketch a graph of Coulomb Force versus distance. Explain the shape of
the graph.
The membrane of a body cell has an ion with a positive charge of 1.6 x
10 –19 C on the outside wall and an ion with a negative charge of -1.6 x
10 –19C on the inside wall. Calculate the magnitude of the electrical force
between these two ions if the membrane thickness is 0.80 x 10 -9m.
Two charges exert a force of 10.0 N on each other when they are
separated by 1.0 m. Indicate the magnitude of the force when:
a. The separation is increased by a factor of 5.
b. The separation is decreased by a factor of 3.
c. The charge of one object is doubled.
d. The charge of one object is decreased by a factor of 3.
A man and a woman, each with no net charge, are separated by 10 m.
What magnitude of negative charge must be transferred from the woman
to the man to cause an attractive force of 200 N?
Hint for 8 – 10: you need to refer to your notes for information about elementary charge values.
8.
If a neutral object loses 1000 electrons, what will be the net charge of the
object?
9. Calculate the electrical force between two protons in the nucleus of a
helium atom when separated by 4.0 x 10-15 m.
10. Measurements show that a honey bee in active flight can acquire an
electrostatic charge as great as 9.30 x 10-13 C . How many electrons
must be transferred to produce this charge? Suppose two bees, each
with a charge of 9.30 x 10-13 C, are separated by a distance of 0.00120
m. Find the magnitude of the electrostatic force experienced by the
bees.
K-Level
Challenge
The two ping-pong balls shown in the diagram each have a mass of 10 g and
also have equal charges. An insulating thread suspends one ball. The other
charged ball is brought to within 12.0 cm of the suspended ball using an
insulated handle. The suspended ping-pong ball is deflected from its rest
position until the thread forms an angle of 30&deg; with the vertical. At this angle,
the forces on the ball are balanced.
a.
b.
c.
d.
Draw a force diagram for all of the forces acting on the suspended ball.
Calculate Fgravity
Calculate Felectric
Calculate how much charge is
on each ping-pong ball.
Topic
Date
Page #
Seed Question
Coulomb’s Law Practice
Exploration
1.
L-level
complete 1– 6.
kC = Coulomb’s constant = 9 x 10
2
9 𝑁∙𝑚
CLASS SET
𝐶2
Two charged particles are separated by a distance of 12 meters. The
Coulomb force between them is 20 N. What will the Coulomb force be if the
same particles are separated by a distance of 6 meters? Draw force diagrams
showing the magnitude and direction of forces on both particles at 12 meters
and at 6 meters.
2.
K-level
complete 4–10.
3.
4.
5.
6.
7.
Two particles are 15 meters apart. Particle A has a charge of 5.0 • 10−4
C, and particle B has a charge of 4.0 • 10−4 C. The resulting Coulomb
force is:
Two charges exert a force of 4.0 N on each other when separated by 1.0
m. Indicate the magnitude of the force when:
a. the separation is doubled
b. the separation is reduced by &frac12;, explain
c. the magnitude of one charge is reduced by &frac12;
d. the magnitude of both charges are doubled
A young woman (m=55 kg) accumulates a charge of +2 x 10-5 C while
sliding out of the front seat of her car. Her boyfriend (m = 80 kg) has
been waiting in the wind and has gained electrons. He now has a charge
of –8 x 10 –5 C. Calculate the magnitude of the electrical force the
woman exerts on her boyfriend when they are 0.5 m apart.
Sketch a graph of Coulomb Force versus distance. Explain the shape of
the graph.
The membrane of a body cell has an ion with a positive charge of 1.6 x
10 –19 C on the outside wall and an ion with a negative charge of -1.6 x
10 –19C on the inside wall. Calculate the magnitude of the electrical force
between these two ions if the membrane thickness is 0.80 x 10 -9m.
Two charges exert a force of 10.0 N on each other when they are
separated by 1.0 m. Indicate the magnitude of the force when:
a. The separation is increased by a factor of 5.
b. The separation is decreased by a factor of 3.
c. The charge of one object is doubled.
d. The charge of one object is decreased by a factor of 3.
A man and a woman, each with no net charge, are separated by 10 m.
What magnitude of negative charge must be transferred from the woman
to the man to cause an attractive force of 200 N?
Hint for 8 – 10: you need to refer to your notes for information about elementary charge values.
8.
If a neutral object loses 1000 electrons, what will be the net charge of the
object?
9. Calculate the electrical force between two protons in the nucleus of a
helium atom when separated by 4.0 x 10-15 m.
10. Measurements show that a honey bee in active flight can acquire an
electrostatic charge as great as 9.30 x 10-13 C . How many electrons
must be transferred to produce this charge? Suppose two bees, each
with a charge of 9.30 x 10-13 C, are separated by a distance of 0.00120
m. Find the magnitude of the electrostatic force experienced by the
bees.
K-Level
Challenge
The two ping-pong balls shown in the diagram each have a mass of 10 g and
also have equal charges. An insulating thread suspends one ball. The other
charged ball is brought to within 12.0 cm of the suspended ball using an
insulated handle. The suspended ping-pong ball is deflected from its rest
position until the thread forms an angle of 30&deg; with the vertical. At this angle,
the forces on the ball are balanced.
a.
b.
c.
d.
Draw a force diagram for all of the forces acting on the suspended ball.
Calculate Fgravity
Calculate Felectric
Calculate how much charge is
on each ping-pong ball.
```