When a wire is stretched to double its length
Asked by admin @ in Physics viewed by 285 People
A wire is stretched to double its length .what will be its new resistivity?
Asked by admin @ in Physics viewed by 285 People
A wire is stretched to double its length .what will be its new resistivity?
Answered by admin @
Answer:
The new resistivity of the material of the wire is .
Explanation:
Given that,
length
The resistance of the wire is equal to the product of resistivity of the material and length of the wire divided by the area of cross section.
The resistance of the wire is defined as,
Where, = resistivity of the material
A = area of cross section
R = resistance of the wire
The volume of both wire is same.
The volume of original wire = volume of new wire
So,
If a wire is stretched to double its length
Then,
The resistivity of the material is ,
The resistivity of the material of the original wire is
.....(I)
The resistivity of the material of the new wire is
.....(II)
The ratio of the resistivity of the material of the wire is
Put the value in the equation
Hence, The new resistivity of the material of the wire is .
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