Question

a wire is stretched so that its length becomes 4 times to its original length if its original register is 25 ohm find its new resistance and resistivity
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Answer 1

Answer:

25 only the answer ok I done the question

Answer 2

Answer:

Explanain:

Resistnace of the wire initially      R=  

A

ρL

 where A=V/L

⟹   R=  

V

ρL  

2

 Now its length is stretched such that new length   L  

′

=xL

Thus resistance of the wire     R   =  

V

ρ(xL)  

2 =x  

2

R

Hence resistance becomes  n  

2

 times the initial resistance.