A potentiometer wire 
of 
length is conneted to a standard cell 
. Another cell 
of emi 
is connected with a resistance ' 
' and switch 
(as shown in figure). With switch 
open, the null position is obtained at a distance of 
from 
. The potential gradient in the potentiometer wire is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Here 
When 
is open, 
Also, 
Potential gradient in the wire, 
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