A wire of a certain material is stretched slowly by 
. Its new resistance and specific resistance becomes respectively
Text Solution
Verified by ExpertsThe correct answer is:
A
Resistance R of a uniform wire is given by 
… .(i)
where, 
resistivity, 
length and 
cross sectional area of wire.
When length is increased by 
,
Volume of the wire remains constant
So, the new resistance
(From (ii))
The specific resistance 
is independent of the dimensions of the material but depends upon the nature of the material. Thus, it remains the same.
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