If each resistance r is along the 12 edg...

If each resistance r is along the 12 edges of a cubical skeleton of uniform wires then find the equivalent resistance between X and Y where X and Y are the midpoints of two opposite edges of a face of the cube.

A

`(7r)/8`

B

`r/2`

C

`(4r)/5`

D

`(7r)/5`

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The correct Answer is:

A

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