A resistance R is to be measured using a meter bridge, student chooses the standard resistance S to be 
. He finds the null point at 
. He is told to attempt to improve the accuracy: Which of the following is a useful way?
and repeat the experiment
and repeat the experiment
Text Solution
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The percentage error in R can be minimized by adjusting the balance point near the middle of the bridge, i.e., when l 1 is close to 50 cm. This requires a suitable choice of S .
Since here, 
imply that the S is nearly 33 times to that of R . In order to make this ratio 
, it is necessary to reduce the value of S nearly 
times, i.e., nearly 
.
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