VITEEE 2013 Paper

The equivalent circuit of the given circuit is

This is a balanced Wheatstone bridge. Therefore, the arm CD becomes in effective. Hence 5Ω and 3Ω are in series and they together are in parallel with (5 + 3) Ω
∴ Net resistance =

(5+3)+(5+3)

(5+3)×(5+3)

= 4 Ω