MOOC 21秋-Essential University Physics-须萍01(苏州大学)1464617175 最新慕课完整章节测试答案

Chap5 Electrostatics

test5.1 Electrostatics

1、单选题：

‏

‏选项：
A: the rod and fur both gain mass.
B: the rod and fur both lose mass.
C: the rod gains mass and the fur loses mass.
D: the rod loses mass and the fur gains mass.
E: none of the above
答案: 【 the rod gains mass and the fur loses mass.】

2、单选题：

‎

‏选项：
A: electrons are less massive than atomic nuclei.
B: the electric force between charged particles decreases with increasing distance.
C: an atomic nucleus occupies only a small part of the volume of an atom.
D: a typical atom has many electrons but only one nucleus.
答案: 【 the electric force between charged particles decreases with increasing distance.】

3、单选题：

‍

选项：
A: the +x-direction.
B: the –x-direction.
C: the +y-direction.
D: the –y-direction.
E: none of the above
答案: 【 the –y-direction.】

4、单选题：

‏

‍选项：
A: the +x-direction.
B: the –x-direction.
C: the +y-direction.
D: the –y-direction.
E: none of the above
答案: 【 the +x-direction.】

5、单选题：

‌选项：
A: is in the direction of the electric field at the position of the point charge.
B: is directly opposite the direction of the electric field at the position of the point charge.
C: is perpendicular to the direction of the electric field at the position of the point charge.
D: is zero.
E: not enough information given to decide
答案: 【 not enough information given to decide】

6、单选题：

‎

‎选项：
A: the +x-direction.
B: the –x-direction.
C: the +y-direction.
D: the –y-direction.
E: none of the above
答案: 【 the +x-direction.】

7、单选题：

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‌选项：
A: where the field lines are closest together.
B: where the field lines are farthest apart.
C: where adjacent field lines are parallel.
D: none of the above
答案: 【 where the field lines are closest together.】

8、单选题：

‌选项：
A: the +x-direction.
B: the –x-direction.
C: the +y-direction.
D: the –y-direction.
E: none of the above
答案: 【 the –y-direction.】

9、单选题：

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‏选项：
A: clockwise.
B: counterclockwise.
C: zero.
D: not enough information given to decide
答案: 【 clockwise. 】

10、单选题：

‌

‏选项：
A: the +x-direction.
B: the –x-direction.
C: the +y-direction.
D: the –y-direction
E: none of the above
答案: 【 the +y-direction. 】

11、单选题：

‌选项：
A: greater.
B: the same.
C: less, but not zero.
D: zero.
E: not enough information given to decide
答案: 【 the same.】

12、单选题：

‏

选项：
A: surface A
B: surface B
C: surface C
D: surface D
E: both surface C and surface D
答案: 【 both surface C and surface D】

13、单选题：

‌

‏选项：
A: the electric field points radially outward.
B: the electric field points radially inward.
C: is zero.
D: not enough information given to decide
答案: 【 is zero.】

14、单选题：

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选项：
A: points generally toward the outer surface of the conductor.
B: points generally away from the outer surface of the conductor.
C: is zero.
D: not enough information given to decide
答案: 【 is zero.】

15、单选题：

‍

‏选项：
A: points outward, toward the surface of the conductor.
B: points inward, away from the surface of the conductor.
C: points parallel to the surface.
D: is zero.
E: not enough information given to decide
答案: 【 is zero.】

16、单选题：

‍选项：
A: a uniformly charged sphere of radius R
B: a spherical shell of radius R with charge uniformly distributed over its surface
C: a right circular cylinder of radius R and height h with charge uniformly distributed over its surface
D: an infinitely long circular cylinder of radius R with charge uniformly distributed over its surface
E: Gauss’s law would be useful for finding the electric field in all of these cases.
答案: 【 a right circular cylinder of radius R and height h with charge uniformly distributed over its surface】

17、单选题：

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‌选项：
A: the field does positive work on it and the potential energy increases.
B: the field does positive work on it and the potential energy decreases.
C: the field does negative work on it and the potential energy increases.
D: the field does negative work on it and the potential energy decreases.
答案: 【 the field does positive work on it and the potential energy decreases.】

18、单选题：

‎

‏选项：
A: the field does positive work on it and the potential energy increases.
B: the field does positive work on it and the potential energy decreases.
C: the field does negative work on it and the potential energy increases.
D: the field does negative work on it and the potential energy decreases.
答案: 【 the field does negative work on it and the potential energy increases.】

19、单选题：

‌

‌选项：
A: the field does positive work on it and the potential energy increases.
B: the field does positive work on it and the potential energy decreases.
C: the field does negative work on it and the potential energy increases.
D: the field does negative work on it and the potential energy decreases.
答案: 【 the field does negative work on it and the potential energy increases.】

20、单选题：

‌

‍选项：
A: the field does positive work on it and the potential energy increases.
B: the field does positive work on it and the potential energy decreases.
C: the field does negative work on it and the potential energy increases.
D: the field does negative work on it and the potential energy decreases.
答案: 【 the field does positive work on it and the potential energy decreases.】

21、单选题：

‍

‌选项：
A: positive.
B: negative.
C: zero.
D: not enough information given to decide
答案: 【 negative.】

22、单选题：

‍

‍选项：
A: positive.
B: negative.
C: zero.
D: not enough information given to decide
答案: 【 negative.】

23、单选题：

‌

‎选项：
A: positive.
B: negative.
C: zero.
D: not enough information given to decide
答案: 【 positive.】

24、单选题：

‏

‌选项：
A: positive.
B: negative.
C: zero.
D: not enough information given to decide
答案: 【 negative.】

25、单选题：

‎

‏选项：
A: A point charge placed at P would feel no electric force.
B: The electric field at points around P is directed toward P.
C: The electric field at points around P is directed away from P.
D: none of the above
E: not enough information given to decide
答案: 【 not enough information given to decide】

26、单选题：

‎

选项：
A: zero.
B: between zero and 90°.
C: 90°.
D: not enough information given to decide
答案: 【 90°.】

27、单选题：

‍

‎选项：
A: is the same as the direction of the electric field at that point.
B: is opposite to the direction of the electric field at that point.
C: is perpendicular to the direction of the electric field at that point.
D: not enough information given to decide
答案: 【 is opposite to the direction of the electric field at that point.】