A resistance of 
is connected in the left gap of a metre bridge and an unknown resistance greater than 
is connected in the right gap. When these resistances are interchanged, the balance point shifts by 
. the unknown resistance is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given, 
and let ' 
' is the unknown resistance
case 
… .(i)
II nd case 
… (ii)
From equation (i) and (ii), we have
Using value of ' 
' in equation (ii), we have
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