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Solution


Q.

Wheatstone bridge principle is used to measure the specific resistance (S1) of given wire, having length L, radius r. If X is the resistance of wire, then specific resistance is; S1=X(πr2L).

If the length of the wire gets doubled then the value of specific resistance will be:                  [2024]
1 S1/4  
2 2S1  
3 S1/2  
4 S1  

Ans.

(4)            

As specific resistance does not depend on dimension of wire so, it will not change.