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Twelve 1Ω resistors are used as edge to form a cube. The resistance between two diagonally opposite corners of the cube is—
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5 Ω 6 -
6 Ω 5 - 1 Ω
- None of these
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Correct Option: A
Suppose value of resistances be RΩ each. Applying KVL by selecting any path between A and B.
| VAB = | . R + | 1 | R + | 1 | R | |
| 3 | 6 | 3 |
| VAB = IR |  |  | |
| 6 |
| = | ||
| I | 6 |
| or RAB = | |
| 6 |
where R = 1 Ω for this problem
| so RAB = | Ω | |
| 6 |
