Download Electric Field Assignment #2 or Quiz

Knowledge &
Understanding
(Sig Figs, Units, Direction)
Scientific Inquiry &
Problem Solving
Communication &
Application
Name:___________________
1
12
Grade 11 Physics – Electric Field Quiz
For full marks, you must show all your work, including formulas.
You must also and use the correct sig figs and units in your answers.
1. Use the following electric field diagram to answer the following questions: (4 marks)
x
y
(a) Is charge C positive or negative?
(b) Is charge D positive or negative?
(c) On the diagram, draw the direction a proton at x would feel a force.
(d) On the diagram, draw the direction an electron at y would feel a force.
2. A charge creates an electric field of 5.0 x 104 N/C [South]. If a test charge of –2.0 ec is
placed in that field, then what is the magnitude and direction of the force on that charge?
(3 marks)
L. Mann
PHY30S
3. An oil drop in a Millikan experiment, whose mass is found to be 4.95 x 10-15 kg is
balanced between two large parallel plates. The electric field strength between the plates
is 5.10 x 104 N/C [down].
(a) Is the top plate positive or negatively charged? (1 mark)
(b) Calculate the charge (in Coulombs) on the oil drop. (2 marks)
(c) Did the oil drop lose or gain electrons? (1 mark)
(d) How many electrons did it lose or gain? (1 mark)
Correct Sig Figs and Units: There will be 1 mark given for using the correct sig figs and units throughout the
quiz. There will be 0.5 marks taken off for each mistake, to a maximum of 1 mark.
L. Mann
PHY30S
Name: _______________________
15
Grade 11 Physics – Electric Field Assignment #2
For full marks, you must show all your work and use the correct
sig figs and units in your answers.
1. Use the following electric field diagram to answer the following questions: (4 marks)
x
y
(a) Is charge C positive or negative?
(b) Is charge D positive or negative?
(c) On the diagram, draw the direction a proton at x would feel a force.
(d) On the diagram, draw the direction an electron at y would feel a force.
2. A positive point charge creates an electric field of 5.0 x 104 N/C at a point directly
south of the charge. If a test charge of –2.0 C is placed at that location, then what is the
magnitude and direction of the force on that charge? (2 marks)
3. A charge of +5.00 C is placed in an electric field between two charged plates. The
electric field strength is 4.00 N/C [down]. The mass of the charged particle is
2.00 x 10-4 kg. Determine the magnitude and direction of the acceleration of the charged
particle between the plates. (3 marks)
L. Mann
PHY30S
4. How many electrons must be removed from an electrically neutral silver dollar to give
it a charge of +2.4 C? (1 mark)
5. An oil drop in a Millikan experiment, whose mass is found to be 4.95 x 10-15 kg is
balanced between two large horizontal plates. The electric field strength between the
plates is 5.10 x 104 N/C [down].
(a) Is the top plate positive or negatively charged? Explain. (1 mark)
(b) What is the charge on the oil drop? (2 marks)
(c) Did the oil drop lose or gain electrons? (1 mark)
(d) How many electrons did it lose or gain? (1 mark)
L. Mann
PHY30S
Grade 11 Physics – Electric Field Practice
1. Use the following electric field diagram to answer the following questions:
x
y
(a) Is charge C positive or negative?
(b) Is charge D positive or negative?
(c) On the diagram, draw the direction a proton at x would feel a force.
(d) On the diagram, draw the direction an electron at y would feel a force.
2. A positive point charge creates an electric field of 5.0 x 104 N/C at a point directly
south of the charge. If a test charge of –2.0 C is placed at that location, then what is the
magnitude and direction of the force on that charge?
3. A charge of +5.00 C is placed in an electric field between two charged plates. The
electric field strength is 4.00 N/C [down]. The mass of the charged particle is
2.00 x 10-4 kg. Determine the magnitude and direction of the acceleration of the charged
particle between the plates.
L. Mann
PHY30S
4. How many electrons must be removed from an electrically neutral silver dollar to give
it a charge of +2.4 C?
5. An oil drop in a Millikan experiment, whose mass is found to be 4.95 x 10-15 kg is
balanced between two large horizontal plates. The electric field strength between the
plates is 5.10 x 104 N/C [down].
(a) Is the top plate positive or negatively charged? Explain.
(b) What is the charge on the oil drop?
(c) Did the oil drop lose or gain electrons?
(d) How many electrons did it lose or gain?
Answers:
1.
2.
3.
4.
5.
a) positive
b) negative
c) and d)
1.0 x 105 N [North]
1.00 x 105 m/s2 [down]
1.5 x 1013 electrons removed
a) Positive. The electric field is the direction a positive would feel a force, and it would be repelled
by the top plate.
b) 9.51 x 10-19 C c) gained electrons
d) 5 electrons
L. Mann
PHY30S