2013年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

2013年AP电磁学（选择题+简答题）真题及答案高清无水印PDF下载

以下为2013年AP电磁学选择题真题内容：

1. A circuit contains a length of tungsten wire with resistance R. An increase in the resistance would result if which of the following could be decreased?

(A) The resistivity of the tungsten

(B) The cross-sectional area of the wire

(C) The length of the wire

(D) The temperature of the wire

(E) The current in the wire

2.

In the circuit shown above, a student has measured the currents that are given in the diagram, but does not know all the resistance values. The magnitude of the potential difference between points A and B is

(A) 10 V

(B) 20 V

(C) 30 V

(D) 35 V

(E) 40 V

3. A capacitor and a capacitor are connected in parallel to a 6.0 V battery. The potential difference across the capacitor is most nearly

(A) 1.3 V

(B) 2.0 V

(C) 3.0 V

(D) 4.0 V

(E) 6.0 V

4. Two parallel, straight conductors carry currents 3I and I in the same direction, as shown in the figure above. A plastic meterstick is held against the wires so that they are positioned at the 0.3 m and 0.7 m mark, respectively. At what position on the meterstick is the magnetic field zero?

(A) Nowhere on the meterstick

(B) At the 0.1 m mark

(C) At the 0.4 m mark

(D) At the 0.6 m mark

(E) At the 0.9 m mark

.......余下真题省略！

以下为2013年AP电磁学简答题真题内容：

Students are given the circuit above in their lab, but they do not know the values of the two resistances Ra and Rb . The battery has a terminal voltage of 24 V and the inductor has an inductance of 0.05 H. Assume the internal resistance of both the battery and the inductor to be negligible. The switch S is closed at time .In order to determine the values of the resistances Ra and Rb , the students measure the current as a function of time through the resistance Ra  . The graph of their results is below.

(a) On the circuit diagram above, insert an ammeter to measure the current through Ra .

(b) Use the data taken by the students to calculate the value of Ra .

(c) Use the data taken by the students to calculate the value of Rb.

(d) Calculate the initial rate of change of current in the inductor.

(e) In reality, both the battery and the inductor have nonnegligible internal resistance. Would the true value of Ra be greater than or less than the value you obtained in part (b)?

                                   ______________Greater than              ______________Less than

Justify your answer.

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