A wire of resistance 4 
is stretched to twice its original length. The resistance of stretched wire would be
A
8 
B
16 
C
2 
D
4 
Text Solution
Verified by ExpertsThe correct answer is:
B
Resistance of a wire, 
(i)
When wire is stretched twice, its new length be 
. Then 
On stretching volume of the wire remains constant.
where 
is the new cross‐sectional area
or 
Resistance of the stretched wire is
(Using (i))
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