A wire of resistance 
is stretched till its radius is half of the original value. Then, the resistance of the stretched wire is :-
Text Solution
Verified by ExpertsThe correct answer is:
D
Resistance 
of a wire of length 1 and radius 
with specific resistance 
of its material is given
As the wire is stretched, mass 
of the wire remains unchanged.
But 
or 
(ii)
Hence, 
...(iii)
Let the resistance of teh stretched wire be 
;
then
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