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If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance R_s, and then connected in parallel so as to give an effective resistance R_p then the ratio $\dfrac{R$ is
32
2
0.5
16

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Reason — Four identical resistors of resistance 8 Ω are connected in series :

So, R_s = 8+8+8+8 = 32 Ω

When connected in parallel:

$\dfrac{1}{R_p}$ = $\dfrac{1}{8}$ + $\dfrac{1}{8}$ + $\dfrac{1}{8}$ + $\dfrac{1}{8}$

$\dfrac{1}{R_p}$ = $\dfrac{1+1+1+1}{8}$ = $\dfrac{4}{8}$ = $\dfrac{1}{2}$

So, R_p = 2 Ω

$\dfrac{R$ = $\dfrac{32}{2}$ = 16

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