A student measures an unknown resistance by a metre bridge. The observations are:
No.
$R (Ω)$
$l (cm)$
$100 - l$
$S = \frac{100 - l}{l} R (Ω)$
1
2
43
57
2.65
2
3
52
48
2.77
3
4
58
42
2.89
4
5
69
31
2.25
The most accurate listed value is:

Question

A student measures an unknown resistance by a metre bridge. The observations are:

No.	$R (Ω)$	$l (cm)$	$100 - l$	$S = \frac{100 - l}{l} R (Ω)$
1	2	43	57	2.65
2	3	52	48	2.77
3	4	58	42	2.89
4	5	69	31	2.25

The most accurate listed value is:

TestHub · Accepted Answer

Relative sensitivity to balance-length error is l ( 100 − l ) 100Δ l ​ . l = 52 cm lies closest to the middle. Use the second listed observation.

Physics - Error Question with Solution | TestHub