Physics Principles and Problems 2009

Chapter 20: Static Electricity

Standardized Test Practice

1
A plastic attracts small bits of paper. One possible explanation is that _________.
A)The comb is negatively charged and the paper is positively charged.
B)Both the comb and the paper are positively charged.
C)Both the comb and the paper are negatively charged.
D)Both the comb and the paper have mixtures of negative and positive charges.
2
An electroscope has an excess of 3.9 × 108 electrons. What is the charge on the electroscope?
A)1.6 × 10–11 C
B)2.4 × 10–11 C
C)4.1 × 10–11 C
D)6.2 × 10–11 C
3
Which is a correct statement about how objects are charged?
A)Objects are almost always charged by creating or destroying protons.
B)Objects are almost always charged by transferring protons from one object to another.
C)Objects are almost always charged by transferring electrons from one object to another.
D)Objects are almost always charged by creating or destroying electrons.
4
If a positive rod is brought near the knob of a neutral electroscope, but does not touch it, what will occur?
A)The knob will become negatively charged, and the leaves will repel each other.
B)The knob will become negatively charged, and the leaves will remain closed.
C)The knob will become positively charged, and the leaves will repel each other.
D)The knob will become positively charged, and the leaves will remain closed.
5
A lightening bolt transfers a charge of 17 C. How many elementary electrical charges does the lightening bolt transfer if it strikes the ground?
A)1.1 × 1018 electrons
B)2.7 × 1018 electrons
C)1.1 × 1020 electrons
D)2.7 × 1020 electrons
6
Which of the following completely summarizes Coulomb's results?
A)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617928/ch20_eq3.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"> (5.0K)</a>
B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617928/ch20_eq4.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>
C)F 8 qAqBr
D)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617928/ch20_eq5.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>
7
A charge, qA, experiences an attractive force of 1.5 × 102 N as a result of a charge, qB, located 2.4 cm away. If qB has a charge of +5.2 × 10–6 C, what is the charge of qA?
A)–1.3 × 10–6 C
B)–1.8 × 10–6 C
C)–3.1 × 10–6 C
D)–7.7 × 10–6 C
8
How will the force between two charged spheres be changed if the distance between the spheres' centers is reduced to half its original value?
A)multiplied by 2
B)multiplied by 4
C)divided by 2
D)divided by 4
9
The diagram shows three charged spheres. Sphere A has a charge of 2.0 × 10–6 C, sphere B has a charge of 3.0 × 10–6 C, and sphere C has a charge of 4.0 × 10–6 C. What is the magnitude of the net force on sphere A? (rAB = 2.0 × 10–2 m and rAC = 2.0 × 10–2 m)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617928/bp.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"> (1.0K)</a>
A)1.4 × 102 N
B)1.6 × 102 N
C)2.0 × 102 N
D)2.3 × 102 N
10
An electroscope is negatively charged, with the leaf at an angle of about 45°. A rod is slowly brought to (but not touching) the knob of the electroscope and the leaf falls. This suggests that the rod is ___________.
A)uncharged or positively charged
B)uncharged or negatively charged
C)positively charged
D)negatively charged
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