Wheatstone bridge principle is used to measure the specific resistance \(( S_1) \) of given wire, having length \( L \), radius \( r \). If \( X \) is the resistance of wire, then specific resistance is; \( S_1 = X \left(\displaystyle \frac{\pi r^{2}}{L} \right) \). If the length of the wire gets doubled then the value of specific resistance will be:
