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  • A resistance R is to be measured using a meter bridge. Student chooses the standard resistance S to be 100. He finds the null point at l_1 = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

A resistance R is to be measured using a meter bridge. Student chooses the standard resistance S to be 100. He finds the null point at l_1 = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?


A. He should measure l1 more accurately.
B. He should change S to 1000and repeat the experiment.
C. He should change S to 3 and repeat the experiment.
D. He should give up hope of a more accurate measurement with a meter bridge.

Answers (1)

The correct answer is the option (c)

Explanation: 

R=S\left (\frac{l_1}{100-l_1} \right )=100\left (\frac{2.9}{97.1} \right )=2.98\Omega

He should aim to get the balance point near the centre (l1=50 cm)

2.98\Omega =S\left (\frac{50}{50} \right )

S\cong 3\Omega

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infoexpert24

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