An unknown resistance X is to be determined using resistances 
or 
. Their corresponding null points are 
and C . Find which of the above will give the most accurate reading and why? 
or 
or 
.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Ans. At all null points, the wheatstone bridge will be balanced. Therefore,
where 
is aconstant and 
and 
are varibles. The maximum faction error is
Неге 
(say),
then
For 
to be minimum,
should be maximum
[since 
constant 
].
Let 
ог 
ог 
Thus, 
gives the most accurate value.
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