1.
|
|
Electrons carry a
|
| positive charge. |
| negative charge. |
| neutral charge. |
| variable charge. |
|
2.
|
|
The units of Coulomb's constants are
|
| 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
|
| 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.
|
|
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?
|
| 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.
|
|
An 'infinite' line of electric charge distributed uniformally through it. The electric Field outside the line at a distance from it R is
|
| zero |
| proportional to R. |
| proportional to 1/R. |
| proportional to 1/R2. |
| proportional to R2. |
|
24.
|
|
 An electric field of 1000 N/C crosses an imaginary area (shown here edge on) of 100 cm2, if the angle q is 60o what is the electric flux?
|
| 5 Nm2/C |
| 50 Nm2/C |
| 500 Nm2/C |
| 5000 Nm2/C |
| 50000 Nm2/C |
|
25.
|
|
In the above question, if the angle q is 90o what is the electric flux?
|
| 0 Nm2/C |
| 10 Nm2/C |
| 100 Nm2/C |
| 1000 Nm2/C |
| 10000 Nm2/C |
| 100000 Nm2/C |
|
26.
|
|
In question 24, if the angle q is 0o what is the electric flux?
|
| 0 Nm2/C |
| 10 Nm2/C |
| 100 Nm2/C |
| 1000 Nm2/C |
| 10000 Nm2/C |
| 100000 Nm2/C |
|
27.
|
|
 A metal sphere has a charge Q, the electric field at a distance R inside the sphere is
|
| zero. |
| proportional to R. |
| proportional to 1/R. |
| proportional to 1/R2. |
| proportional to R2. |
|
28.
|
|
In the above question the electric field at a radius R outside of the sphere is
|
| zero |
| proportional to R. |
| proportional to 1/R. |
| proportional to 1/R2. |
| proportional to R2. |
