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ABCD is a square of side 'a' metres and ...

ABCD is a square of side 'a' metres and is made of wires of resistance x ohms//metre. Similar wires are connected across the diagonals AC and BD. The effective resistance between the ax corners A and C will be

A

`(2 - sqrt2) ax`

B

6ax

C

3ax

D

` (3-sqrt2) ax`

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The correct Answer is:
A
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