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The equivalent resistance between A and B is [Figure: a rectangular loop drawn as a 3 by 2 grid. The top-left corner is split into two terminals: A leads into the top side, B leads into the left side. Top side from A: 6 Ω to top-middle node P, then 10 Ω to the top-right corner. Right side: 5 Ω down to right-middle node S, then 7 Ω down to the bottom-right corner. Bottom side from the right: 8 Ω to bottom-middle node V, then 11 Ω to the bottom-left corner. Left side from the bottom: 4 Ω up to left-middle node X, then 8 Ω up to B. A plain vertical wire joins P to V. A plain horizontal wire joins X to S, hopping over the vertical wire without contact.]

Asked in JEE Main 9th April 1st Shift 2024 · Series and parallel combinations

• (1) 25 Ω
• (2) 18 Ω
• (3) 27 Ω
• (4) 19 Ω

Step-by-step solution

Why the other options are wrong

• (1) No standard slip gives 25 Ω; it would need the middle block to be 11 Ω instead of 5 Ω.
• (2) No standard slip gives 18 Ω; it would need the middle block to be 4 Ω.
• (3) No standard slip gives 27 Ω; it would need the middle block to be 13 Ω.

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