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1 | |
Rubbing a glass rod with a silk cloth leaves a negative charge on the cloth. |
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| | A) | True |
| | B) | False |
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2 | |
If two objects placed closely together repel each other electrically, we can be sure that they are both charged. |
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| | A) | True |
| | B) | False |
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3 | |
Bringing a negatively charged rod closer and closer to a positively charged electroscope causes the leaf to converge. |
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| | A) | True |
| | B) | False |
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4 | |
The process of charging an object by induction leaves a charge on the object that is opposite to that of the charging device. |
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| | A) | True |
| | B) | False |
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5 | |
Because of its large size, the coulomb is not a practical unit for static electricity. |
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| | A) | True |
| | B) | False |
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6 | |
According to Coulomb’s law, the electric force will be doubled if them separation of two equal charges is cut in half. |
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| | A) | True |
| | B) | False |
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7 | |
If two nearby objects experience a mutual force of electric attraction, they must both be electrically charged. |
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| | A) | True |
| | B) | False |
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8 | |
When two or more charges are in the vicinity of another charge, the latter charge experiences an electric force equal to the algebraic sum of the forces due to each charge. |
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| | A) | True |
| | B) | False |
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9 | |
The plus and minus signs used to identify charge have significance primarily for determining direction when they are applied to Coulomb’s law. |
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| | A) | True |
| | B) | False |
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10 | |
One coulomb is that quantity of charge that, when placed one meter away from an equal charge of the same sign, will experience a repulsive force of one newton. |
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| | A) | True |
| | B) | False |
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11 | |
A negatively charged body |
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| | A) | has a deficiency of electrons |
| | B) | has an excess of electrons |
| | C) | is produced on glass by rubbing with silk |
| | D) | repels a positively charged body |
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12 | |
Which of the following represents the largest measure of charge? |
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| | A) | 1 µC |
| | B) | 1 nC |
| | C) | 1012 electrons |
| | D) | 10-7 C |
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13 | |
Charging a single body by induction always leaves a residual charge that is |
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| | A) | greater than that of the charging object |
| | B) | the same sign as that of the charging body |
| | C) | opposite in sign to that of the charging object |
| | D) | an excess of electrons |
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14 | |
Decreasing the separation of two identical positive charges by one-half will cause the force of repulsion to change by a factor of |
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| | A) | 4 |
| | B) | 2 |
| | C) | ½ |
| | D) | ¼ |
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15 | |
When two suspended objects are seen to attract each other electrically, |
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| | A) | they are both charged |
| | B) | one must be charged |
| | C) | either (a) or (b) is true |
| | D) | neither (a) nor (b) is true |
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16 | |
Two balls each having a charge of +12 µC are 8 cm apart. The electric force is approximately |
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| | A) | 0.02 N |
| | B) | 40 N |
| | C) | 202 N |
| | D) | 404 N |
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17 | |
If a repulsive force of 2.0 N is observed between two identical 9- µC charges, their separation must be approximately |
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| | A) | 6 cm |
| | B) | 3.6 cm |
| | C) | 60 cm |
| | D) | 36 cm |
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18 | |
Three charges of +4, +8, and -2 nC are at the corners of an equilateral triangle 6 cm on a side. The magnitude of the force on the 8-nC charge is approximately |
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| | A) | 6.93 X 10-5 N |
| | B) | 3.47 X 10-5 N |
| | C) | 6 X 10-5 N |
| | D) | 2.7 X 10-5 N |
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19 | |
A charge of 6 µC is 10 cm to the right of a -4-µC charge. The resultant force on a 2-nC charge placed 4 cm to the right of the 6-µC charge is |
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| | A) | 4.75 X 1-2 N |
| | B) | 8.75 X 1-2 N |
| | C) | 6.75 X 10-2 N |
| | D) | 2 X 10-2 N |
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20 | |
As a positively charged rod is brought closer and closer to a positively charged electroscope, the gold leaf |
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| | A) | diverges |
| | B) | converges |
| | C) | is neutralized |
| | D) | is unaffected |
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21 | |
An object that has an excess of electrons is charged and will repel a(n) charged body. |
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22 | |
A(n) is a material through which charge may be transferred easily, whereas a(n) resists the flow of charge. |
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23 | |
A charge of 1 µC is equivalent to a charge of C. |
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24 | |
The first law of electrostatics states that like charges and unlike charges . |
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25 | |
Rubbing a wool cloth against a rubber rod transfers from the to the . |
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26 | |
The process of charging without the necessity of direct contact with a charged body is called . |
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27 | |
According to law, the electric force is inversely proportional to the square of the between two charges. |
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28 | |
A charge of 1 C is equivalent to that charge represented by electrons. |
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29 | |
The smallest unit of charge is the , which has a charge of C. |
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30 | |
The is a laboratory device used to detect the presence of charge. |
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