The resistance of each straight section `r = 2 Omega`. Find the equivalent resistance (in ohms) between A and B.

Answer

7

Explanation

The circuit can be simplified as shown in the above figure. Due to symmetry, we can see that the distribution of current at point A in the circuit, is the same as the recombination of the current before point B. Also, the junction which is present between the points C and D can be disconnected because it won.t affect the distribution of current.
`r _(AB) = r + 1. 5 r + r `
` implies r_(AB) = 3.5 r = 7 Omega`