In the given circuit of potentiometer, the potentital difference 
across 
is larger than 
and 
as well. For key 
(closed), the jockey is adjusted to touch the wire at point 
so that there is no deflection in the galvanometer. Now the first battery 
is replaced by second battery 
for working by making 
open and 
closed. The galvanometer gives then null deflection at 
. The value of 
is 
, where 
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