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  • What is the minimum resistance which can be made using five resistors each of 1/5 Ω? (a) 1/5 Ω (b) 1/25 Ω (c) 1/10 Ω (d) 25 Ω

What is the minimum resistance which can be made using five resistors each of 1/5 Ω? 
(a) 1/5 Ω 
(b) 1/25 Ω 
(c) 1/10 Ω 
(d) 25 Ω 

Answers (1)

Answer: (b)

Solution:
Minimum resistance is obtained by connecting all the resistors in parallel.
Parallel combination of n equivalent resistors of R\Omega is =(R/n)\Omega
R_{p}=R/n=\frac{\frac{1}{5}}{5}\Omega =\frac{1}{25}\Omega

Therefore, option (b) is correct.

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infoexpert26

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