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

2014 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）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 R_2?immediately after the switch is closed.
   2. A long time after the switch is closed, will the magnitude of the current in R_2?be greater than, less than, or equal to the current through R_2?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 R_2?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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