A resistance \( R \) is to be measured using a meter bridge. Studen...

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A resistance \( R \) is to be measured using a meter bridge. Student chooses the standard resistance \( S \) to be \( 100 \Omega \). He finds the null
\( \mathrm{P} \) point at \( l_{1}=2.9 \mathrm{~cm} \). He is told to attempt to improve the accuracy. Which of the following is a useful way?
W
(a) He should measure \( l_{1} \) more accurately.
(b) He should change \( S \) to \( 1000 \Omega \) and repeat the experiment.
(c) He should change \( S \) to \( 3 \Omega \) and repeat the experiment.
(d) He should give up hope of a more accurate measurement with a meter bridge.
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