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Grade: 

                        
The length of a given cylindrical wire is increased by 100%.Due to the consequent decrease in diameter the change in the resistance of the wire will be? 1)200% 2)100% 3)50% 4)300%
2 years ago

Answers : (1)

Saurabh Koranglekar
askIITians Faculty
8407 Points 
							Ans 4- 300%

R = rho*l/A

Volume is constant

l’ = 2l then A’ = A/2

R’ = 4R

therefore change in Resistance is 3*R*100/R = 300%
2 years ago
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