CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

A wire of resistivity p(rho symbol) is stretched to double of its length.Find its new resistance and resistivity.


Solution

The resistivity of the wire remains unchanged, as it only depends on the material of the wire.


We have

Resistance= Resistivity x length/area

When the wire is stretched to double the length , the area of cross section gets reduced to half.

So

New Resistance = Resistivity x 2length/area/2

I.e,

New resistance = (Resistivity x area/length)x4

i.e, New resistance = Resistance x 4


 

flag
 Suggest corrections
thumbs-up
 
0 Upvotes


Similar questions
View More...



footer-image