2017 AP Physics C物理C—Electricity and Magnetism电磁真题系列之简答题免费下载

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2017 AP Physics C Electricity&Magnetism Free-Response Questions Free Download

2017 AP 物理C电磁简答题部分免费下载

此套题仅 p II含有简答题，

共计时45分钟，共3题

占总分50%

每道大题可能含有不同数量的小题

可以使用计算器

部分真题预览：

1）A very large nonconducting slab with a uniform positive volume charge density ρ₀ is fixed with the origin of the xyz-axes at its center, as shown in the figure above. The thickness of the slab is d, the length is L, and the width is W, where L >> d, and W >> d. The large faces of the slab are parallel to the xy-plane.
Consider a Gaussian cylinder with a cross-pal area A and height h that is positioned with its axis along the z-axis, as shown in the figure below.

1. Draw a single vector on each of the dots below representing the direction of the electric field at the given points. If the electric field at either point is zero, write "E=0" next to the point.
2. Use Gauss’s law to derive expressions for the following. Express your answers in terms of ρ₀, A, d, h, z, and physical constants, as appropriate.
   1. Derive an expression for the total flux Φ through the Gaussian surface shown.
   2. Derive an expression for the magnitude of the electric field as a function of z for any position inside the slab, and show that it is equal to E = ρ₀^z/ε₀ .
      The charged slab is now placed between two large metal plates separated by a distance of 0.010m, which is approximately the thickness of the slab, but the slab does not contact either metal plate. The metal plates are charged, resulting in the surface charge densities σ = ±2.0 × 10^-6 C/m², as shown in the figure above.
      Assume the charge distribution inside the slab remains unchanged by the presence of the charged plates and that the slab’s volume charge density is ρ₀= 1.00 × 10^-3 C/m³.
3. 1. The magnitude of the electric field inside the slab is zero on the z-axis at position Z₀. Which of the following correctly indicates the value for Z₀?
      _____Z₀ >0_____Z₀=0______Z₀<0
      Justify your answer.
   2. Calculate the valueZ₀.
4. Calculate the magnitude of the electric potential difference from the center of the slab to the top of the slab.

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