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  2. A wire of length has a resistance . It is gradually stretched till its length becomes
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A wire of length L_o has a resistance R_o . It is gradually stretched till its length becomes 2 L_o .

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

(b) What will be its resistance when its length becomes 2 L_o ?

 

 

 
 
 
 
 

Answers (1)
S safeer

a)

b)

R_0=\rho \frac{L_0}{A_0}

When the wire is stretched the volume remains the same

\\A_0L_0=A_22L_0\\A_2=A_0/2

R_2=\rho \frac{2L_o}{A_0/2}=4R_0

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