Download Name: Period: _____ Electrostatics Unit Packet CP Physics Ms

Name:
__________________________________________
Period:
Electrostatics
Unit Packet
CP Physics
Ms. Pacetti
_____
Notes/Diagrams
Additional Notes/Examples
Notetaking
Electrical Forces:


Electromagnetic Forces vs. Gravitational
Forces:
Electromagnetic Force
Gravitational Force
Fundamental Rule of Electrical Phenomena
Diagram:
Additional Notes/Examples
Notetaking
Charged Objects:

 Ions =
 Negatively charged materials:
 Positively charged materials:
Conservation of Charge:

 Do you create charges?
 Note:
Coulomb’s Law:

 Unit of charge =
 Equation:
Additional Notes/Examples
Notetaking
Conductors and Insulators:
 conductors:
 insulators:
 semiconductors:
 superconductors:
Charging Objects:
 Friction
 Conduction
 Induction
Additional Notes/Examples
Notetaking
Grounding:
Lightning:


Charge Polarization:



Ex:
Water molecules:
Additional Notes/Examples
Notetaking
Electric Fields:



Electric Fields – Lines of Force:
 Definition:
 Field Strength:
 Length indicates:
 Direction indicates:
 Interaction between charges:
Electric Shielding:

 Real reason why car is safest in a
Thunderstorm:
Additional Notes/Examples
Notetaking
Electrical Potential Energy:

 Separating positive from negative:
 Pushing like charges together:
Electrical Potential:

 Also called:
 Unit =


Capacitors:
 Where:
 Use:

 Fully charged?
 Discharges?
 Example:
Additional Notes/Examples
Notetaking
Van de Graff Generators:
 What is it?
 How do charges move?
 What is electric field inside?
 What can result?
 Why does your hair stick up when you
are touching it?
CP PHYSICS
COULOMB’S LAW
1.
Name: _________________________________
____ period
Fill in the chart with the correct information:
Fel = k Q1Q2
k = 9.0 x 109 N•m2/C2
d2
Symbol
Variable
Unit
Fel
(
)
Q1 and Q2
(
)
d
(
)
k
2.
3.
a.
If both charges are +, Fel is ______.
If both charges are -, Fel is ______.
b.
If one charge is + and the other charge is -, then Fel is _____.
The diagram at the right is of a hydrogen atom.
a.
Draw and label the charges of the nucleus and electron.
b.
Fel between the nucleus and the electron is ( + , - )
c.
If the magnitude of charge of either the proton in the nucleus or the electron were
greater, the force would be (greater, less).
d.
If the electron jumps to a higher energy level, further away from the nucleus, the
force will be (greater, less).
Consider the electric force between a pair of charged particles a certain distance apart.
By Coulomb’s Law: (Rule of ones)
a.
If the charge of one of the particles is doubled, the force is:
(one-fourth)
(halved)
(doubled)
(quadrupled)
b.
If, instead, the charge of both particles is doubled, the force is:
(one-fourth)
(halved)
(doubled)
(quadrupled)
c.
If, instead, the distance between the particles is doubled, the force becomes:
(one-fourth)
(halved)
(doubled)
(quadrupled)
d.
If the distance is halved and the charges of both particles are doubled, the force is
___________ as great.
CP PHYSICS
COULOMB’S LAW EXAMPLE PROBLEMS
Name: _______________________
___ period
EQUATION:
1.
Anthea rubs two latex balloons against her hair, causing the balloons to become
charged negatively with 2.0 x 10-6 C. She holds them a distance of 0.70 m apart.
What is the electric force between the two balloons? Is it a repulsive or attractive
force?
2.
When sugar is poured from the box into the sugar bowl, the rubbing of sugar grains
creates a static electric charge that repels the grains, and causes sugar to go flying out
in all directions. If each of two sugar grains acquires a charge of 3.0 x 10-9 C and they
experience a repulsive force of 0.0013 N, how far apart are they?
3.
A raindrop acquires a negative charge of 3.0 x 10-18 C as it falls. The force of attraction
when the raindrop is 6.0 cm from the bulb on the end of a car antenna is 1.5 x 10-11 N.
What is the charge on the end of the car antenna?
4.
Boppo the clown carries two mylar balloons that rub against a circus elephant causing
the balloons to separate. One balloon acquires a charge of 3.4 x 10-7 C, while the other
balloon acquires 2.0 x 10-7 C of charge. How large is the electric force between them
when they are separated by a distance of 50 cm?
CP PHYSICS
COULOMB’S LAW PROBLEMS I
Name: ________________________
___ period
Part I – Rule of Ones:
Using the Rule of Ones, determine how the following changes will affect the electrical force
between two charges:
1.
How does Fel change if one of the charges doubles?
_________
2.
How does Fel change if both of the charges are doubled?
_________
3.
How does Fel change if the distance doubles?
_________
4.
How does Fel change if one charge doubles and the distance doubles?
_________
5.
How does Fel change if the distance is reduced to half?
_________
Part II – Coulomb’s Law Problems:
Use GUESS and show all work!!! Circle your final answers.
1.
What is the electric force experienced by two negative charges of – 3.5 x 10-6 C that
are located 0.45 m apart?
2.
A positive charge of 2.8 x 10-5 C is located 1.3 m from a negative charge of -7.4 x 10-4
C. What is the electric force experienced by the two charges?
CP PHYSICS, COULOMB’S LAW PROBLEMS I, page 2
3.
Two identical charges of 8.1 x 10-6 C experience a force of 7.5 N. How far apart are
they from each other?
4.
A negative charge of – 6.0 x 10-6 C exerts an attractive force of 65 N on a second
charge 0.050 m away. What is the magnitude of the second charge?
5.
A force of – 4.4 x 103 N exists between a positive charge of 8.0 x 10-4 C and a negative
charge of – 3.0 x 10-4 C. What distance separates the charges?