2015年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

2015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2015年AP电磁学选择题真题内容：

1-2题:

Three particles each with charge +Q are placed on three corners of a square, as shown above. The sides of the square have length s. Point C is at the center of the square.

1. What is the direction of the electric field at point C ?

(A) →
(B) ←
(C) ↖
(D) ↙
(E) ↘

2.The particle at corner P is allowed to move while the other two particles are held in place. What is the work done by the electric field as the particle at corner P moves to infinity?
(A) 2kQ²/s
(B) 2kQ/s
(C) KQ/s²
(D) kQ²/s²
(E) 2kQ²/s²

.......余下真题省略！

以下为2015年AP电磁学简答题真题内容：

1.You perform a laboratory experiment to determine the unknown charge on a small conducting ball of mass m using the experimental setup shown in the diagram above. A variable power supply applies a DC voltage to two large parallel plates separated by a distance d, creating a uniform electric field. The charged ball hangs between the plates on an insulated thread of length L and is displaced from its lowest point, coming to equilibrium at an angle q with the vertical. During the experiment, you measure the angle q when the voltage indicated on the power supply is V 。

(a) On the dot below that represents the conducting ball, draw and label the forces (not components) that act on the conducting ball. Each force must be represented by a distinct arrow starting on, and pointing away from, the dot.

(b) Derive an expression that would allow you to calculate the magnitude of the unknown charge on the ball given q , V , m, d, L, and fundamental constants, as appropriate. If you need to draw anything other than what you have shown in part (a) to assist in your solution, use the space below. Do NOT add anything to the figure in part (a).

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