What is the minimum resistance

Question:

What is the minimum resistance which can be made using 1 five resistors each of 1/5 Ω ?

(a) $\frac{1}{5} \Omega$

(b) $25 \Omega$

(c) $\frac{1}{10} \Omega$

(d) $\frac{1}{25} \Omega$

 

Solution:

(d).

Explanation: $\frac{1}{R}=\frac{1}{1 / 5}+\frac{1}{1 / 5}+\frac{1}{1 / 5}+\frac{1}{1 / 5}+\frac{1}{1 / 5}=25$

or $R=\frac{1}{25} \Omega$

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