2014年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

2014年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

以下为2014年AP电磁学选择题真题内容：

1. Which of the following Gaussian surfaces would be the simplest to use to determine the electric field intensity near a long, straight, charged wire?

(A) A cylinder whose axis coincides with thewire

(B) A cylinder whose axis is perpendicular to the wire and passes through the wire

(C) A sphere with the wire through its center

(D) A cube with the wire passing through the centers of opposite faces

(E) A cube with the wire along a diagonal

2-4题

A uniform electric field exists between two parallel plates that are perpendicular to an x-axis and separated by 0.01 m, as shown above on the left. The graph above on the right shows the electric potential between the plates as a function of position x on the x-axis.

2.What is the electric potential energy of an object with a 1.0μC chaarge located at x=0.005m?
(A) -20μJ
(B) -10μJ
(C) Zero
(D) 10μJ
(E) 20μJ

3. What is the magnitude of the electric field between the plates at X=0.005m?

(A) 0

(B) 0.1 V/m

(C) 0.2 V/m

(D) 1000 V/m

(E) 2000 V/m

4. What is the direction of the electric field between the plates at points on the x-axis?

(A) To the left at all points

(B) To the right at all points

(C) To the left for x<0.005 m and to the right for x>0.005 m

(D) To the right for x<0.005 m and to the left for x>0.005 m

(E) It is undefined because the field is zero at all points.

.......余下真题省略！

以下为2014年AP电磁学简答题真题内容：

Two metal bars of length L are held a vertical distance d apart （L>>d）open parenthesis, as shown in the figure above. Each wire carries a current I, and the wires repel each other. The current is to the left in the bottom metal bar.

(a) In the figure above, draw an arrow indicating the direction of the current in the top bar.

(b) In the figure above, use appropriate symbols to indicate the direction of the magnetic field both above and below the bottom bar due to its current I.

(c) Derive an expression for the magnetic force acting on the top bar in terms of I, L, d, and fundamental constants, as appropriate.

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