Question

A wire of 13 ohm resistance is stretched to double its length. Find out the new resistance wire

Answer 1

As we realize that ;  

Obstruction = Resistivity*length/territory  

Here we take note of that the obstruction is straightforwardly relative to length and conversely corresponding to region of cross area ....  

Presently a/c to address,;  

Length of wire is twofold then zone is decreased to half...  

Presently  

New opposition = resistivity*2length/region/2  

New opposition =(resistivity*length/area)*4  

New opposition = 4resistance  

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