A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances ( 
). When 
resistance is heated to some temperature, its resistance value has gone up 
. The potential difference 
(after 
is heated) is 
V.
Text Solution
Verified by ExpertsThe correct answer is:
B
Initially, the Wheatstone bridge is balanced with 
.
Since the bridge is balanced, the potential difference across the bridge is zero: 
.
When 
is heated and its resistance increases by 
The voltage at node 
(between 
and 
): 
The voltage at node 
(between 
and 
): 
Therefore: 
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