A wire of length L_o has a resistance R_o . It is gradually stretched till its length becomes 1.5 L_o .

(a) Plot the graph showing variation of its resistance R with its length l during stretching.

(b) What will be its resistance when its length becomes 1.5 L_o ?

 

 

 
 
 
 
 

Answers (1)
S safeer

a) 

b) 

\\R_0=\frac{\rho L_0}{A}\\

When the wire is stretched the volume remains the same.

\\AL_0=A'1.5L_0\\A'=\frac{A}{1.5}

\\R'=\frac{\rho 1.5 L_0}{A/1.5}\\=2.25R_0

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