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我省95年中考物理试题有这样一道电学题.电路如图所示,电阻 R 的阻值为10欧,滑动变阻器的最大阻值为20欧,电源电压为12
The province’s 95-year high school entrance examination physics test has such an electric problem. As shown in the circuit, the resistance of the resistor R is 10 ohms, the maximum resistance of the sliding varistor is 20 ohms, and the power supply voltage is 12