A cylindrical rod is reformed to half of its original length keeping volume constant. If its resistance before this change were R, then the resistance after reformation of rod will be
Text Solution
Verified by ExpertsThe correct answer is:
B
The resistance of rod before reformation
Now the rod is reformed such that,
( 
Volume remains constant,
or 
…(i)
Now the resistance of the rod after reformation 
or, 
(using (i))
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