2009 AP Physics C物理C—Electricity and Magnetism电磁真题系列之简答题免费下载

历年AP Physics物理学系列

真题与答案下载

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2009 AP Physics C Electricity&Magnetism Free-Response Questions Free Download

2009 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 spherically symmetric charge distribution has net positive charge Q0 distributed within a radius of R.
Its electric potential V as a function of the distance r from the center of the sphere is given by the following.

Express all algebraic answers in terms of the given quantities and fundamental constants.

1. For the following regions, indicate the direction of the electric field E(r) and derive an expression for its magnitude.
   1. r < R
      ____ Radially inward ____ Radially outward
   2. r > R
      ____ Radially inward ____ Radially outward
2. For the following regions, derive an expression for the enclosed charge that generates the electric field in that region, expressed as a function of r.
   1. r < R
   2. r > R
3. Is there any charge on the surface of the sphere (r = R) ?
   ____ Yes ____ No
   If there is, determine the charge. In either case, explain your reasoning.
4. On the axes below, sketch a graph of the force that would act on a positive test charge in the regions r < R and r > R. Assume that a force directed radially outward is positive.

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