2017 AP Physics C物理C—Electricity and Magnetism電磁真題系列之簡答題免費下載

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

2017 AP 物理C電磁簡答題部分免費下載

此套題僅?p II含有簡答題，

共計時45分鐘，共3題

占總分50%

每道大題可能含有不同數量的小題

可以使用計算器

部分真題預覽：

1）A very large nonconducting slab with a uniform positive volume charge density?ρ_0?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?
      _____Z_0?>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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