如图甲所示的电路中,R1为定值电阻,R2为滑动变阻器,电源电压不

如图甲所示的电路中,R1为定值电阻,R2为滑动变阻器,电源电压不变。闭合开关S后,滑片Pa端移动到b端,电流表示数I与电压表示数U的变化关系如图乙所示,则电源电压为________VR2的最大阻值为_______Ω

 


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