The effective resistance between A and B in the figure is `7/12 Omega` .If each side of the cube has 1 `Omega` resistance The effective resistance between the same two points, when the link AB is removed is

Options

A. `7/12 Omega`
B. `5 / 12 Omega`
C. `7/5 Omega`
D. `5/7 Omega`

Answer

C

Explanation

`R_(AB) =(7)/(12 ) Omega x=?`
` therefore R_(AB ) = (x xx 1)/( x+1)`
` implies (7)/(12) =(x )/( x+1) implies 7x +7 = 12 x implies x =(7)/(5) Omega `