2017年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

2017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2017年AP电磁学选择题真题内容：

1-2题：In the figure above, two small spheres, each with charge +Q, are fixed in place at the corners of an equilateral triangle. Point I is at the third corner, and point II is midway between the charges.

1.1.A small particle with charge +q,where q<<Q,is moved from point I to point II at constant speed v by an external force. WEXT is the work done by the external force on the moving charge,and WELEC  is the work done by the electrostatic force. Which of the following correctly identifies the signs of these quantities?

              WEXT       WELEC 

A.              +             +

B.              +              -

C.              -              +

D.              -              -

(E) None of the above, since the work done by both the external force and the electrostatic force is zero.

.......余下真题省略！

以下为2017年AP电磁学简答题真题内容：

1. The electric potential in a region of space as a function of position x is given by the equation

V(x)=αX² + βx − γ , where α= 2V/m2 , β=7V/m , and γ=15V. All nonelectrical forces are negligible.

(a) An electron starts at rest at x = 0 and travels to x = 20 m.

• i. Calculate the magnitude of the work done on the electron by the electric field during this process.
• ii. Calculate the speed of the electron at x = 20 m.

(b) Derive an equation for the x-component of the electric field as a function of position x.

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