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

A resistance R is to be measured using a meter bridge. Student chooses the standared resistance S to be `100 Omega`. He finds the null point at `l_(1)=2.9cm`. He is told to attempt to improve the accuracy. Which of the folllowing is a useful way?

A

He should measure `I_(1)` more accurately

B

he should changes to `1000Omega` and repeat the experiment

C

He should change S to 3 `Omega` and repeat the experiment

D

He should given up hoe of a more accurate measurement with a meter bridge

Text Solution

Verified by Experts

The percentage error in R can be minimised by adjusting the balance point near the middle of 1 the bridge i.e., when `I_(1)` is close to 50 cm. The requries a suitable choices of S.
Since, `(R)/(S)=(R1_(1))/(R(100-1_(1)))=(1_(1))/(100-1_(1))`
Since there `R:S::2.9:97.1` imply that the S is nearly 33 times to that of R. In orded to make this ratio `1:1` it is necessary to reduced the value of S nearly `(1)/(33)` times i.e,. nearly `3Omega`
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