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JEE Mains Model Paper 4
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© examsnet.com
Question : 47
Total: 90
A resistance R is to be measured using a meter bridge, a student chooses the standard resistance S to be 100Ω. 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?
He should measure
l
1
more accurately
He should changes S to 1000Ω and repeat the experiment
He should changes S to 3Ω and repeat the experiment
He should have given up hope of a more accurate measurement with a meter bridge.
Validate
Solution:
The percentage error in R can be minimized by adjusting the balance point near themiddle of the bridge, i.e., when 1, is close to 50 cm. This requires a suitable choice of S.
Since
R
S
=
l
1
100
−
l
1
; Since here R : S = 0.9 : 97.1 then the value of S is nearly 33 times to that of R. In order to make this ratio 1 : 1, it is necessary to reduce the value of S nearly 1/33 times, i.e., nearly 3Ω .
© examsnet.com
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