2012年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

2012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2012年AP电磁学选择题真题内容：

1. A proton moving along the positive x-axis enters an electric field that is directed along the positive y-axis. What is the direction of the electric force acting on the proton after it enters the electric
field?
(A) Along the negative z-axis
(B) Along the positive z-axis
(C) Along the negative y-axis
(D) Along the positive y-axis
(E) The direction cannot be determined since the magnitude of the electric field is not known.

2-4题：

Three particles having charges of +q, +Q, and -Q are placed at the corners of an equilateral triangle of side a, as shown above.

2. The net force on the particle with charge +q due to the other two charges is in the plane of the page and directed
(A) vertically upward
(B) vertically downward
(C) horizontally to the right
(D) horizontally to the left
(E) toward the charge -Q

3. The magnitude of the force on the particle with charge +q due to the other two charges is
(A)
kqQ/a
(B)
2kqQ/a
(C)
2kqQ/a²
(D)
2kqQsin60°/a²
(E)
2kqQcos60°/a²

4. The potential energy of the particle with charge +q due to the other two charges is
(A) zero
(B)-2kQ/a
(C)kqQ/a
(D)2kqQ/a
(E)2kqQ/a²

.....余下真题省略。

以下为2012年AP电磁学简答题真题内容：

Two thin, concentric, conducting spherical shells, insulated from each other, have radii of 0.10 m and 0.20 m, as shown above. The inner shell is set at an electric potential of -100 V , and the outer shell is set at an electric potential of +100 V, with each potential defined relative to the conventional reference point. Let Qi and Qo represent the net charge on the inner and outer shells, respectively, and let r be the radial distance from the center of the shells. Express all algebraic answers in terms of Qi, Qo , r, and fundamental constants, as appropriate.

(a) Using Gauss’s Law, derive an algebraic expression for the electric field E(r) for 0.10 m < r < 0.20 m .
(b) Determine an algebraic expression for the electric field E(r) for r > 0.20 m .

(c) Determine an algebraic expression for the electric potential V(r) for r > 0.20 m .
(d) Using the numerical information given, calculate the value of the total charge Qt on the two spherical shells (Qt=Qi+Qo ) 

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