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Rank A, B and C from largest to
smallest magnitude of electric field
• By the way,
homework
is due
tomorrow
Which of the following diagrams is
accurate for a positive charge?
Which of the following diagrams is
accurate for a negative charge?
Which of the following diagrams is
accurate for a positive charge?
Which of the following diagrams is
accurate for a negative charge?
A "free" electron and "free" proton are
placed in an identical electric field. Which of
the following statements are true?
A. Each particle experiences the same electric
force and the same acceleration
B. The electric force on the proton is greater in
magnitude than the force on the electron but
in the opposite direction.
C. The electric force on the proton is equal in
magnitude to the force on the electron, but
in the opposite direction.
D. Both particles experience the same
acceleration.
A test charge of +3 µC is at a point P where the
electric field due to other charges is directed to the
right and has a magnitude of 4  106 N/C. If the
test charge is replaced with a –3 µC charge, the
electric field at P
A. has the same magnitude but changes
direction
B. increases in magnitude and changes
direction
C. remains the same
D. decreases in magnitude and changes
direction
We know about electric field
intensities
• We know how to draw electric field lines
• We know how to measure the intensity of the
electric field
+
-
When we use force to move
something, we do work
-
Work done in moving a charge through
a field is called potential difference
-
There are two ways of writing the
potential difference equation
If 500J of work are performed to move 25C
of charge from a positive plate to a negative
plate, what potential difference exists
between the plates?
How much work is done to transfer
20C of charge through an electric
potential difference of 12.0V?
The electric field intensity between two
charged plates is 3 x 104 N/C. The plates
are 0.50m apart. What is the electric
potential difference in volts between the
plates?
A voltmeter indicates that the electric potential
difference between two plates is 60.0V. The
plates are 0.04m apart. What electric field
intensity exists between them?
A 9-V battery does 1800J of work
transferring charge. How much charge
is transferred?
Pick any 4 to solve!!!
1. If 160J of work are performed to move 2C of charge from
a positive plate to a negative plate, what potential
difference exists between the plates?
2. How much work is done to transfer 0.14C of charge
through an electric potential difference of 12.0V?
3. A 9-V battery does 2700J of work transferring charge. How
much charge is transferred?
4. The electric field intensity between two charged plates is
4.5 x 103 N/C. The plates are 0.90m apart. What is the
electric potential difference in volts between the plates?
5. A voltmeter indicates that the electric potential difference
between two plates is 60.0V. The plates are 0.03m apart.
What electric field intensity exists between them?