In the above arrangement, each side of the cube has 1 Ω Ω resistance and it is known that the effective resistance between A and B is 5/9 Ω Ω . Now, if the resistor between A and B is removed, then find the new effective resistance (in Ω Ω ) between the same two points.
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(1.25)
( i) For a cube of resistors each of resistance 
, the equivalent resistance between two edges on the same face is
(ii) If 
is removed, assuming the equivalent resistance between remaining resistors is 
,
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