I1(R1+R2/2)=I2(R1+R2),即:I1(R1+5)=I2(R1+10) ----(1)
滑片在b端时,电流比在中点c时小,即I1/I2=6/5 ----(2)
联立二式,得R1=20欧
前后两次电压表示数之比是(I1R1)/(I2R1)=I1/I2=6/5
I1(R1+R2/2)=I2(R1+R2),即:I1(R1+5)=I2(R1+10) ----(1)
滑片在b端时,电流比在中点c时小,即I1/I2=6/5 ----(2)
联立二式,得R1=20欧
前后两次电压表示数之比是(I1R1)/(I2R1)=I1/I2=6/5