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  1. Find equivalent resistance. Each resistance is l Ω

    2. A.
    5/12 Ω
    B.
    5/6 Ω
    C.
    6/5 Ω
    D.
    6/10 Ω

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    Answer : Option B

    Explanation :

    Cut the cuboid at XY - AB plane. This will make two parallel and symmetrical loops. Resistance between XY and AB = 1 Ω Splitting it in two equal values resistances

    Solving one of the loop

    Use Δ - Y transformation

    ⇒ RP'Q' = + (1.6 || [1.2 + 2]) = 1.667 Ω

    ∴ Req = RP'Q' || RP'Q' =

    .

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