The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance
Text Solution
Verified by ExpertsThe correct answer is:
A
As given that same tension is applied on the wires, for extension we use young's law equation i.e. 
, where 
is the young's modulus.
Now as we know that stress 
, where F is the force and A is the area. Then we know 
where r is the radius, also 
, where D is the diameter.
Thus, wire A has the largest extension.
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