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Question

How should the two resistances of 8 Ω each must be connected to produce an equivalent resistance of 4 Ω ?

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Solution

As the resultant resistance is lesser than the individual resistances.
The arrangement of the system should be in parallel.
We can prove it with the help of this formula,

1R=1R1+1R21R=18+181R=1+181R=281R=14 R=4Ω

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