In the network shown in figure each resistance is `1 Omega`. The effective resistance between A and B is

Options

A. `8/7 Omega`
B. `7/8 Omega`
C. `1Omega`
D. `2Omega`

Answer

A

Explanation

As given circuit is symmetrical when a battery is connected across AB, the current entering at A must be symmetrical to current leaving at B.
There it is immaterial weather point E touches to point F or not

Thus, the above circuit is simplified as shown in the following figure.

Thus, from figure, equivalent resistance between point A and point B is given by,
`R_(AB)= (8)/(7) Omega`.