2014 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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2014 AP Physics C Electricity&Magnetism Free-Response Questions Free Download

2014 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）Physics students are analyzing the circuit above. A variable DC power supply is connected to an ammeter and three resistors. The resistances of two of the resistors are known to be
R₂  = R3 = 50Ω, but the resistance of the third resistor is unknown. The students collect data on the potential difference across the power supply and the current measured by the ammeter, as follows.

1. On the grid below, plot the data points for the current as a function of the potential difference. Clearly scale and label all axes, including units if appropriate. Draw a straight line that best represents the data.
2. Using the straight line from part (a), calculate the total resistance of the three-resistor combination.
3. Calculate the value of R₁.
   The power supply is now fixed at 12 V.
4. Calculate the current through R₂
5. Resistor 3 is now removed and replaced by an open switch in series with an uncharged 4 nF capacitor, as shown below. The power supply is still fixed at 12 V.
   1. Calculate the current in R₂ immediately after the switch is closed.
   2. A long time after the switch is closed, will the magnitude of the current in R₂ be greater than, less than, or equal to the current through R₂ found in part (d) ?
      _____Greater than_____Less than_____Equal to
      Justify your answer.
6. The 4 nF capacitor is replaced with an uncharged 10 nF capacitor. Will the magnitude of the current in R₂ immediately after the switch is closed be greater than, less than, or equal to the current in part (e)i ?
   _____Greater than______Less than_____Equal to
   Justify your answer.

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