如图中已知R1=R2=……=Rn=Rn+1=……=Rm=Rm+1=R/2,R=40欧,电源电压60伏.流

如图中已知R1=R2=……=Rn=Rn+1=……=Rm=Rm+1=R/2R=40欧,电源电压60伏.流过Rn的电流大小是           

答案

15 x (1/2)n-1

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