Particulate Nature of Matter B.5 Electric Circuits (id: 8b0a2da32)

本题目来源于试卷: Particulate Nature of Matter B.5 Electric Circuits，类别为 IB物理学

[单选题]
Two identical lamps ),d7akf: y gmi6woq : +d,uabm$L_1​$ and $L_2​$ are connected to a cell with no internal resistance as shown below. Resistors $R_1​$ and $R_2​$ are also identical. Switch $S$ controls part of the circuit.


Which of the following statements about the brightness of the lamp $L_2​$ are correct?

I. If the resistance of $R_2$​ increases, the brightness of $L_2​$ increases.
II. If the resistance of $R_1​$ increases, the brightness of $L_2​$​ decreases.
III. If switch $S$ is opened, the brightness of $L_2​$ ​ does not change.

A. $I$ only
B. $I$ and $II$ only
C. $II$ and $III$ only
D. $I$, $II$, and $III$


参考答案:  C


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