1.
|
|
Electrons carry a
|
| positive charge. |
| negative charge. |
| neutral charge. |
| variable charge. |
|
2.
|
|
The units of Coulomb's constants are
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| Nm2/C2 |
| Nm |
| Nm/C2 |
| C2 |
|
3.
|
|
The units of permittivity are
|
| unitless |
| 1/4*pi |
| Nm2 |
| C2/Nm2 |
|
|
|
The unit of a charge is the
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| N(ewton) |
| m(eter) |
| J(oule) |
| C(oulomb) |
|
5.
|
|
Which of the following are the units of electric field?
|
| N |
| N*C |
| N/C |
| N/m2 |
|
6.
|
|
Two charges Q1 and Q2 are separated by a distance D. If the distance is doubled, the force is
|
| increased by a factor of 2. |
| decreased by a factor of 2. |
| remains the same. |
| increased by a factor of 4. |
| decreased by a factor of 4. |
|
7.
|
|
Two charges Q1 and Q2 are separated by a distance D. If Q1 is doubled, the force is
|
| increased by a factor of 2. |
| decreased by a factor of 2. |
| remains the same. |
| increased by a factor of 4. |
| decreased by a factor of 4. |
|
8.
|
|
Two charges Q1 and Q2 are separated by a distance D. If Q1 and Q2 are doubled, the force is
|
| increased by a factor of 2. |
| decreased by a factor of 2. |
| remains the same. |
| increased by a factor of 4. |
| decreased by a factor of 4. |
|
9.
|
|
Two charges Q1 and Q2 are separated by a distance D. If both Q1 and D are doubled, the force is
|
| increased by a factor of 2. |
| decreased by a factor of 2. |
| remains the same. |
| increased by a factor of 4. |
| decreased by a factor of 4. |
|
10.
|
|
Two charges Q1 and Q2 are separated by a distance D. If Q1, Q2 and D are all doubled, the force is
|
| increased by a factor of 2. |
| decreased by a factor of 2. |
| remains the same. |
| increased by a factor of 4. |
| decreased by a factor of 4. |
|
11.
|
|
In the above figure, if Q1 is negative and has magnitude less than Q2 which is positive, where could a positive charge be placed and possibly have a zero net force on it?
|
| A |
| B |
| C |
| D |
| E |
|
12.
|
|
In the above figure, if Q1 and Q2 are positive, where could a negative charge be placed and have a vertically upward net force on it?
|
| A |
| B |
| C |
| D |
| E |
|
13.
|
|
In the above figure, if Q1 and Q2 are positive, where would the electric field be vertically upward ?
|
| A |
| B |
| C |
| D |
| E |
|
14.
|
|
In the above figure, if Q1 and Q2 are positive and the same size, where would the electric field be zero ?
|
| A |
| B |
| C |
| D |
| E |
| Not shown. |
|
15.
|
|
In the above figure, if Q1 is negative and Q2 is positive and are both the same magnitude, where would the electric field be zero ?
|
| A |
| B |
| C |
| D |
| E |
| Nowhere shown. |
|
16.
|
|
In the above figure, if Q1 is negative and Q2 is positive and the distance from Q2 to point C is 1/4 the distance between the charges, how many times greater than Q2 in magnitude must Q1 be for the Electric field to be zero at C?
|
| 4 |
| 10 |
| 16 |
| 20 |
| 25 |
|
17.
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|
In the above figure if the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x106, what is the magnitude of the net electric field?
|
| zero |
| 7.1x105 |
| 1.0x106 |
| 1.4x106 |
| 2.0x106 |
|
18.
|
|
In the above figure the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x106. If Q1 is negative and Q2 is positive what is the direction of the net electric field at B?
|
| Vertical and up. |
| Horizontal and to the right. |
| Vertical and down. |
| Horizontal and to the left. |
|
19.
|
|
In the above figure the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x106. If both Q1 and Q2 are positive what is the direction of the net electric field at B?
|
| Vertical and up. |
| Horizontal and to the right. |
| Vertical and down. |
| Horizontal and to the left. |
|
20.
|
|
The figure above shows a metal shell surrounding a positive charge. What is the charge on the metal surface at b?
|
| negative |
| zero |
| positive |
|
21.
|
|
The figure above shows a metal shell surrounding a positive charge. Which of the following statements is true?
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| The electric field at e is less than that at a and c. |
| The electric field at c is greater than that at a and e. |
| The electric field at c is less than that at a and e. |
| The electric field at e is greater than that at a. |
|
22.
|
|
In question 20 what would be the charge on the exterior surface (d)?
|
| negative |
| zero |
| positive |
|
23.
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Four people tell you they have a negative charge of a certain value. Which one is not telling the truth?
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| Mine is 1.90x10-18 Coulomb. |
| Mine is 1.6x10-18 Coulomb. |
| Mine is 1.92x10-18 Coulomb. |
| Mine is 2.4x10-16 Coulomb. |
|
24.
|
|
What must be the charge on each of two 100 kg spherical masses in order for the electrical force to equal the gravitational force?
|
| 8.6x10-19 C |
| 8.6 nanoC |
| 7.4x10-17 C |
| 100 C |
|
25.
|
|
How many electrons would it take to make up a charge of minus one millionth of a Coulomb?
|
| 100000 |
| 10000000 |
| 8x1042 |
| 6.25x1012 |
