在图5电路中，R110Ω，R220Ω，闭合开关后，电流表的示

在图5电路中，R₁=10Ω，R₂=20Ω，闭合开关后，电流表的示数为0.3A。求（1）电阻R₁两端的电压是多少？
（2）通过R₂的电流是多少？

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