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A student chooses the stancdard resistan...

A student chooses the stancdard resistance S to be `100Omega` while measuring a resistance R by using a metre bridge He finds the null point at `l_(1)=2.9` cm . He is told to attempt to improve accuracy . Which of the following is a useful way ?

A

He should measure `l_(1)` more accurately

B

He should change S to `1000Omega` and repect the experiment

C

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

D

He should give up hope of a more accurate measurement with a metre brige

Text Solution

Verified by Experts

The correct Answer is:
C
`R=Sxx(l_(1))/(100-l_(1))=(100xx2.9)/(100-2.9)=3Omega`
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Knowledge Check

  • The null point of a metre bridge is at 40 cm when resistance X and Y are placed in left and the right gaps , respectively . The following observations show the resistance in the left right gaps and the nul point respectively . Which of them are correct ?

    A
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    B
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    C
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    D
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