a wire of resistance 4ohm is streched twice the orginal length how does resistance and resistivity change?

Asked by farzul hazan C.S | 14th Jul, 2013, 06:11: AM

Expert Answer:

Resistivity does not depend on the physical characteristics of the wire. It is just a property of the material itself. Hence, if you change the length of the wire, its resistivity would not change. 
However, if you will double its length, then the resistance would also get doubled i.e. 8ohms as 
R = resisitivity  *length/area. 

Answered by  | 14th Jul, 2013, 06:15: PM

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