A resistance R is to be measured using a metre bridge. Student chooses the standard resistance S(right gap) to be 100$\mathrm{\Omega }$. He finds the null point at l₁= 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way ?

The best measurements are taken when the null point in obtained around the mid point of the wire when resistances in the left and right gap are nearly equal . Since the length measurement l₁ is very small , the resistance of the left gap should be increased or right gap should be reduced .