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一、选择题(每小题2分,共18分) 1.用丝绸摩擦玻璃棒,使玻璃棒带正电荷,丝绸带等量的负电荷,这是因为( )。 (A)丝绸上一些正电荷转移到玻璃棒上 (B)丝绸上一些负电荷转移到玻璃棒上 (C)玻璃棒经摩擦后产生了正电荷 (D)玻璃棒上的一些电子转移到丝绸上 2.现将电阻值分别为R_1和R_2的两个电阻器串联后接入电源电压为12伏特的电路中,测得电阻R_2两端电压为9伏特;若将电阻R_1、R_2并联后接入某电路中,测得通过R_1的电流强度为1.5安培,则通过电阻R_2的电流
First, the multiple-choice questions (2 points for each question, a total of 18 points) 1. Use a silk friction glass rod, so that the glass rod with a positive charge, the same amount of negative charge of the silk belt, this is because (). (A) Some positive charge on the silk is transferred to the glass rod (B) Some negative charge on the silk is transferred to the glass rod (C) The glass rod generates a positive charge after being rubbed (D) Some electrons on the glass rod are transferred to the silk Above 2. Now connect two resistors whose resistance values are R_1 and R_2 in series and connect them to a circuit with a 12-volt supply voltage. Measure the voltage across resistor R_2 at 9 volts; connect resistors R_1 and R_2 in parallel. Into a circuit, measured by the current intensity of R_1 is 1.5 amps, the current through the resistor R_2