题目:
如图所示的电路中,电源电压为10V,滑动变阻器的值R1=200 Ω,电阻R2=50 Ω,当滑动变阻器的滑片从a滑到b时,电压表的示数变化范围是
[ ]A.0~2V
B.0~10V
C.2V~10V
D.1V~5V
答案:
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