2009 AP Physics C物理C—Electricity and Magnetism電磁真題系列之簡(jiǎn)答題免費(fèi)下載

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

2009 AP 物理C電磁簡(jiǎn)答題部分免費(fèi)下載

此套題僅?p II含有簡(jiǎn)答題，

共計(jì)時(shí)45分鐘，共3題

占總分50%

每道大題可能含有不同數(shù)量的小題

可以使用計(jì)算器

部分真題預(yù)覽：

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.