To solve this problem, we need to analyze both the assertion and the reason and verify their correctness as well as the linkage between them.
The correct option is: "Both A and R are correct and R is the correct explanation of A."
A wire of uniform resistance \(\lambda\) \(\Omega\)/m is bent into a circle of radius r and another piece of wire with length 2r is connected between points A and B (ACB) as shown in figure. The equivalent resistance between points A and B is_______ \(\Omega\).