A) He should measure \[{{l}_{1}}\] more accurately
B) He should change S to \[1000\text{ }\Omega \]and repeat the experiment
C) He should change S to \[\text{3 }\Omega \] and repeat the experiment
D) He should give up hope of a more accurate measurement with a meter bridge
Correct Answer: C
Solution :
(c) He should change S to \[\text{3 }\Omega \] and repeat the experiment As the meter bridge is balanced, \[\therefore \frac{R}{S}=\frac{{{l}_{1}}}{(100-{{l}_{1}})}or\,R=\frac{S{{l}_{1}}}{(100-{{l}_{1}})}\] \[=\frac{(100\,\Omega )(2.9\,cm)}{(100-2.9)\,cm}\approx 3\,\Omega \] The accuracy of measuring R can be improved, if S and R are of the same order, i.e., S should be changed to \[3\,\Omega \].
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