# 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.

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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