Question

find the minimum resistance that can be made using five resisters each of 5 ohm

Answer 1

The minimum resistance is always obtained when the resistors are connected in parallel combinations.
1/Rp = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5
= 1/5 + 1/5 + 1/5 + 1/5 + 1/5
= 5 /5 = 1 ohm.
Thus Rp = 1/1
therefore Rp = 1 ohm.

Answer 2

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