Physics Principles and Problems 2009

Chapter 21: Electric Fields

Standardized Test Practice

1
A positive test charge of 4.0 × 10–6 C is in an electric field that exerts a force of 2.0 × 10–4 N on it. What is the magnitude of the electric field at the location of the test charge?
A)5.0 × 101 N/C
B)2.0 × 102 N/C
C)4.0 × 102 N/C
D)8.0 × 102 N/C
2
An electric field strength of 6.0 × 104 N/C is measured using a positive test charge of 2.5 × 10–6 C. What is the electrostatic force on the test charge?
A)0.15 N
B)0.42 N
C)1.5 N
D)4.2 N
3
The ratio of charge transferred to potential difference is called _____.
A)voltage
B)capacitance
C)a capacitor
D)resistance
4
The diagram shows a positive test charge in an electric field and the force the test charge experiences. What is the charge if the electric field strength is 1.2 × 105 N/C?

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A)1.1 × 10–6 C
B)2.7 × 10–6 C
C)4.7 × 10–6 C
D)6.4 × 10–6 C
5
What is the direction of the electric field at the location of the test charge?

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A)25° north of east
B)25° north of west
C)25° south of east
D)25° south of west
6
When a charge of 2.4 × 10–5 C is added to a capacitor, the potential difference increases from 10.6 V to 16.2 V. What is the capacitance of the capacitor?
A)1.5 μF
B)2.4 μF
C)4.3 μF
D)9.1 μF
7
Which best describes electric potential difference?
A)the work needed to move a positive test charge between two points in an electric field divided by the magnitude of that test charge
B)the electrostatic force on a positive test charge divided by the magnitude of the test charge
C)the magnitude of a positive test charge divided by the work needed to move the test charge between two points in an electric field
D)the magnitude of a positive test charge multiplied by the electrostatic force on that test charge
8
Two charged parallel plates that are 2.0 × 10–2 m apart have an electric field between them with a magnitude of 1600 N/C. What is the electric potential difference between the plates?
A)4.0 V
B)8.0 V
C)32 V
D)33 V
9
A sphere has an electric potential difference between it and Earth of 30.0 V when it has been charged to 3.5 × 10–6 C. What is its capacitance?
A)0.12 μF
B)1.1 μF
C)5.3 μF
D)8.6 μF
10
Which of the following shows the electric field lines for two protons and one electron?
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B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617929/bs.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (4.0K)</a>
C)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617929/bt.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (4.0K)</a>
D)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617929/bu.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (3.0K)</a>
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