A potential divider consists of two resistors of resistances $R_1$ and $R_2$ connected in series across a source of potential difference (p.d.) ${V_{in}}$. The p.d. across $R_1$ is ${V_{out}}$.
Which changes to $R_1$ and $R_2$ will increase the value of ${V_{out}}$?

1 )
A
B
3 )
C
4 )
D
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