2012 AP Physics C物理C—Electricity and Magnetism电磁真题系列之Practice Exam简答题免费下载

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2012 AP Physics C Electricity&Magnetism Practice Exam Free-Response Questions Free Download

2012 AP 物理C电磁模考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）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 Q_i and Q_o 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 Q_i , Q_o , r, and fundamental constants, as appropriate.

1. Using Gauss’s Law, derive an algebraic expression for the electric field E(r) for 0.10 m < r < 0.20 m .
2. Determine an algebraic expression for the electric field E(r) for r > 0.20 m .
3. Determine an algebraic expression for the electric potential V(r) for r > 0.20 m .
4. Using the numerical information given, calculate the value of the total charge Q_T on the two spherical shells (Q_T= Q_i + Q_o) .
5. On the axes below, sketch the electric field E as a function of r . Let the positive direction be radially outward.
6. On the axes below, sketch the electric potential V as a function of r .

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