A resistance R is to be measured using a meter bridge.

A resistance R is to be measured using a meter bridge. Student chooses the standard resistance S to be 100Ω. 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?

(a) he should measure l1 more accurately

(b) he should change S to 1000 Ω and repeat the experiment

(c) he should change S to 3 Ω and repeat the experiment

(d) he should give up hope of a more accurate measurement with a meter bridge