A potential divider is used to give outputs of $4\,V$ and $8\,V$ from a $12\,V$ source. Which combination of resistances, $(R_1 : R_2 : R_3)$ gives the correct voltages
A$2 : 1 : 2$
B$1 : 1 : 1$
C$2 : 2 : 1$
D$1 : 1 : 2$
Medium
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B$1 : 1 : 1$
b
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