In a meter bridge experiment to determine the value of unknown resistance, first the resistances 
and 
are connected in the left and right gaps of the bridge and the null point is obtained at a distance 
from the left. Now when an unknown resistance 
is connected in parallel to 
resistance, the null point is shifted by 10 cm to the right of wire. The value of unknown resistance 
is 
.
Text Solution
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(6)
Meter bridge null point condition: 
Initial: 
, null at 
gives 
, so 
When 
connected in parallel with 
: 
New null point at 
from left:
gives 
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