Download Read Chapter 1 in the textbook (pages 4 – 21)

Name: ________________________________________
Block: _____
Date: _____/_____/_____
CONCEPTUAL PHYSICS
Chapter 33 Study Guide: Electric Fields & Potential
MULTIPLE CHOICE
Choose a response for each item in this section. Write your response on the line provided.
_____1. An electric field has _____.
a. direction
b. magnitude
c. velocity
d. both (a) and (b)
_____2. Every proton in the universe is surrounded by its own _____.
a. gravitational field
c. atmosphere
b. electric field
d. both (a) and (b)
_____3. The direction of electric field lines shows the _____.
a. direction of the force on a positive charge
c. strength of the electric field
b. size of the electric field
d. all of the above
_____4. The electric field inside a charged conductor is _____.
a. always positive
c. zero
b. always negative
d. opposite of the charge on the conductor
_____5. Electric potential energy of a charged object is a result of its _____.
a. momentum
c. mass
b. location
d. velocity
_____6. When an electron is moved near a negatively charged sphere, its potential energy increases. The reason
this happens is because _____.
a. opposite charges attract
c. work is done against an electric field
b. like charges repel
d. all of the above
_____7. If two protons are held closely together, when they are released they will _____.
a. accelerate toward each other
c. remain motionless
b. accelerate away from each other
d. move away from each other at a constant speed
_____8. Electric potential is _____.
a. electric potential energy divided by charge
b. measured in joules per coulomb
c. measured in volts
d. all of the above
_____9. In a uniform electric field, the field lines will _____.
a. get closer together
c. appear parallel and equally spaced
b. get further apart
d. point in random directions
_____10. The electric field around an electron _____ if the distance from the electron is doubled.
a. is half as much
c. stays the same
b. is twice as much
d. is one-fourth as much
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Name: ________________________________________
Block: _____
Date: _____/_____/_____
CONCEPTUAL PHYSICS
SHORT ANSWERS
Respond to each item in this section using complete sentences, unless directed otherwise. Record your response
on the lines or in the space provided.
1. Draw two circles and label them as positive and negative by placing the appropriate sign inside of each.
Sketch the field lines between the charges using a minimum of five lines. Use arrows to indicate the direction
of the electric field.
2. How can electric field lines help determine the relative strength at different regions within an electric field?
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3. Compare electrical potential energy to gravitational potential energy. How are they similar? How are they
different?
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Name: ________________________________________
Block: _____
Date: _____/_____/_____
CONCEPTUAL PHYSICS
CALCULATIONS
Problems in this section require a numerical response. Be sure to include the appropriate unit with each
response. Write your response on the line provided.
1. 100,000 electrons are removed from a neutral plastic ball. Calculate the magnitude of the charge on the ball.
2. What is the force exerted on a 3.2 C charge in an electric field of 2.4  106 N/C?
3. An electron experiences a force of 3.5  10– 6 N. Calculate the force of the electric field surrounding the
electron.
4. A Van de Graaff generator is switched on and acquires 0.003 C of charge. Calculate the electric field strength
0.5 m away from the generator.
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