What is the minimum resistance which can be made using five resistors each of 15Ω?
A
15Ω
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B
125Ω
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C
110Ω
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D
25Ω
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Solution
The correct option is B125Ω Minimum resistance will be achieved when all the resistors are connected in parallel. 1Rmin=115+115+115+115+115 ⇒1Rmin=5+5+5+5+5=25 ⇒Rmin=125Ω