Transcript 0 volts A B C D E

MIMTY 1/19/11 or 1/20/11
What does electric potential mean?
MIMTY
Summarizing Notes
notes
Take the next 5 minutes and do the following:
1)Summarize your notes from yesterday in a paragraph.
2) Create 3 questions you could ask about these notes.
Your questions should use verbs from the following parts
of your verb sheet:
- 1 question using “knowledge” or “comprehension”
- 1 question using “application” or “analysis”
- 1 question using “evaluation” or “synthesis”
 1 more question using “synthesis”
Electric Potential Review
Which of the charges shown below has the highest charge?
A
B
D
C
E
Electric Potential Review
An electron is placed in the electric field as shown below. Which way
will the electron move over a short period of time?
A) up
B) left
C) down
D) right
E) It won’t move
electron
Electric Potential Review
Imagine the shape below was made of metal and was covered with a
negative charge. Where would the charge be most concentrated?
A
B
C
D
E
A) “A”
B) “B”
C) “C”
D) “D”
E) “E”
Electric Potential Review
Which drawing below shows how the electric field lines would look
outside the charged sphere? Assume the charge is +1.
no lines
A
B
C
D
E
Electric Potential Review
Which point on the diagram below has the highest voltage for a
positive charge?
0 volts
A
B
C
D
E
A) “A”
B) “B”
C) “C”
D) “D”
E) “E”
Assignment List
Assignment
Get syllabus signed
7 Devices for phys II
Electric Charge PP
Electrostatic Walkaround Lab
Electric Potential PP
Assigned
Due
1/4/11
1/6/11
1/11/11
1/12/11
1/19/11
1/10/11
1/10/11
1/18/11
1/18/11
1/27/11
Electric Potential Practice Problems
1) We have 2 charges as shown below. At which point A, B, or
classwork
C (or D: none of them) is the electric field zero? Prove it!
 Where (if anywhere) in problem #1 is the electric potential zero?
2) A drop of ink carries a charge of 1.6 x 10-10 C and is deflected in an electric
field with a force of 3.2 x 10-4 N. What is the strength of this field?
3) A lightning bolt uses 200 million joules of energy. If this bolt carries 2 C of
charge, what is the voltage of the bolt?
4) How can electric field lines show the strength of an electric field?
5) The Earth has an electric field with a strength of 1000 N/C. This field points
inward toward the center of the Earth. Is the Earth positively or negatively
charged?
6) Find the voltage change when an electric field
does 12 J of work on a 0.0001 C charge.

Which direction is the electric field pointing
at the black dot in the 2 examples at right?
Quiz Review
Below are a number of practice problems to help you get
ready for the quiz. If you feel confident with these,
study on your own or catch up with missing work.
-
Explain how any combination of 2 charged particles
will move when placed near each other.
Explain the difference between charge and energy.
Define electric potential and voltage.
Be able to find the force between any 2 charges.
Know the difference between electric field and electric
potential.
Know the difference between charging by induction
and charging by contact.
Know how to calculate the strength of an electric field.
Exit Question #7
The electric potential of one negative charge placed next
to another negative charge will be....
a.
b.
c.
d.
e.
f.
Low
High
Low but negative
High but negative
It depends on the size of each charge
It depends on exactly how close they are