Physics Principles and Problems 2009

Chapter 21: Electric Fields

Chapter Test Practice

1
Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.
A)toward, away from
B)toward, toward
C)away from, toward
D)away from, away from
2
According to Coulomb's law, the force on a test charge is __________ the test charge.
A)greater than
B)equal to
C)less than
D)proportional to
3
A positive test charge of 9.0 × 10-5" to "9.0×10-5 C is in an electric field that exerts a force of 3.7×10-5 N on it. What is the magnitude of the electric field at the location of the test charge?
A)0.24 N/C
B)2.4 N/C
C)0.41 N/C
D)4.1 N/C
4
The electric field at the location of q' is represented by which of the following equations?
A)E = F/q'
B)E = q'/Fq'
C)E = q/ΔV
D)E = W/q'
5
An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?
A)changes rapidly
B)downward
C)upward
D)stationary
6
An electric field is to be measured using a positive test charge of 3.0×10-5C. This test charge experiences a force of 0.50 N acting at an angle of 15°. What is the magnitude of the electric field at the location of the test charge?
A)1.7×103 N/C
B)6.0×10-5 N/C
C)0.49 N/C
D)1.7×104 N/C
7
A negative charge of 1.5×10-7 C experiences a force of 0.030 N to the right in an electric field. What is the magnitude and direction of the field?
A)4.5×10-7 N/C directed to the right
B)2.0×105 N/C directed to the right
C)4.5x10-9 N/C directed to the left
D)2.0×105 N/C directed to the left
8
The __________ is a vector quantity that relates the force on a test charge to the size of the charge.
A)electric field
B)equipotential
C)potential
D)capacitor
9

In the set-up of the figure below, if a drop is moving up with a constant speed, then ___.

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A)the lower plate must be negatively charged
B)the upper plate must be negatively charged
C)the gravitational force on the drop must be equal to the electric force on the drop
D)the gravitational force on the drop must be less than the electric force on the drop
10
The direction of the electric field is the direction of the__________.
A)work done moving the test charge
B)potential difference
C)force on the positive test charge
D)force on the negative test charge
11
Two parallel plates are given opposite charges. A voltmeter measures the electric potential difference to be 47.0 V. The plates are 5.0 cm apart. What is the magnitude of the electric field between them?
A)1.1×10-3 N/C
B)1.1×10-3 N/C
C)9.4×102 N/C
D)9.4×103 N/C
12

In the figure below, if both charges were 7.0 μC and the left charge were held in place while the right charge were moved from a separation of 0.4 m" to "0.40 m, what would be the magnitude of the difference in the electric potential energy of the system between the initial and final positions?

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A)4.4 J
B)2.2 J
C)1.1 J
D)3.3 J
13
In a Millikan oil drop experiment, a drop has been found to weigh 1.92×10-14 N. When the electric field is 3.0×104 N/C, the drop is suspended motionless. What is the charge on the oil drop?
A)5.8×10-10 C
B)6.4×1019 C
C)6.4×10-19 C
D)5.8×10-19 C
14
Touching a body to Earth to eliminate excess charge is called __________.
A)resistance
B)grounding
C)static
D)capacitance
15
Both a 1.2-μF and a 5.5-μF capacitor are connected across an 11-V electric potential difference. Which capacitor has the greater charge and what is it?
A)5.5 &muF; 1.3×10-5 C
B)1.2 μF; 6.1×10-5 C
C)1.2 μF; 1.3×10-5 C
D)5.5 μF; 6.1×10-5 C
16
The electric field intensity between two large, charged, parallel metal plates is 6500 N/C. The plates are 12 cm apart. What is the electric potential difference between them?
A)7.8×10-2 V
B)7.8×102 V
C)7.8×104 V
D)7.8×105 V
17
What electric potential difference is applied to two metal plates 0.350 m apart if the electric field between them is 3.75×103 N/C?
A)1.07×103 V
B)1.31×103 V
C)1.31×103 V
D)1.31×100 V
18

In the figure below, if both charges were 7.0 μC and the left charge were held in place while the right charge were moved from a separation of 0.4 m" to "0.40 m, how much work would be done on the system?

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A)-2.2 J
B)-1.1 J
C)1.1 J
D)2.2 J
19
If 2.0×102 J of work are performed to move one coulomb of charge from a positive plate to a negative plate, what potential difference exists between the plates?
A)1.6×10-19 V
B)2.0×102 V
C)2.0×103 V
D)5.0×10-3 V
20
The SI derived unit of potential difference is the __________.
A)ohm
B)volt
C)joule
D)coulomb
21
A voltmeter reads 450 V across two charged, parallel plates that are 5.0 cm apart. What is the electric field between them?
A)9.0×101 N/C
B)1.1×10-4 N/C
C)9.0×103 N/C
D)9.0×102 N/C
22
A 35-μF capacitor has an electric potential difference of 50.0 V across it. What is the charge on the capacitor?
A)1.8×103 C
B)1.8×10-3 C
C)1.75×10-0 C
D)1.4×10-6 C
23
The ratio of charge stored to electric potential difference is called the __________.
A)resistance
B)current
C)capacitance
D)capacitor
24

In the set-up of the figure below, if the electric force up on a drop equals the gravitational force down on the drop, the drop ___.

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A)will accelerate up
B)will accelerate down
C)must be stationary
D)could move upward at constant speed
25
As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.
A)remains the same
B)increases
C)decreases
D)doubles
26
Electric potential difference is measured in __________.
A)newtons per coulomb
B)coulombs per joule
C)joules per coulomb
D)volts per coulomb
27

In the set-up of the figure below, if a drop is moving down with a constant speed, then ___.

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A)the gravitational force on the drop must be equal to the electric force on the drop
B)the gravitational force on the drop must be greater than the electric force on the drop
C)the lower plate must be negatively charged
D)the upper plate must be negatively charged
28
When the electric potential difference between two positions in an electric field is zero, the positions are __________.
A)polar
B)in equilibrium
C)close together
D)at equipotential
29
What work is done when 3.5 C is moved through an electric potential difference of 4.5 V?
A)1.6×101 J
B)-1.6×101 J
C)1.6×101 J/C
D)7.8×101 J
30
A 6.4-μF capacitor is first charged so that the electric potential difference is 5.0 V. How much additional charge is needed to increase the electric potential difference to 12.0 V?
A)7.7×10-5 C
B)4.5×10-5 C
C)4.5×105 C
D)7.7×105 C
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