Question

The length of a wire is increased to twice while keeping its volume constant. The
resistivity
of wire become
By increasing the
volume of a wire fixed, its length is increased to double The
resistivity of the wire becomes​

Answer 1

Answer:

4 times

Explanation:

if length is twiced having constant volume then cross-section area become half .then find new resistance by formula rho.l/A . then we will get 4 R (R=initial resistance)

Answer 2

Given : The length of a wire is increased to twice while keeping its volume constant.

To Find: The  resistivity  of wire become

Solution:

R = ρ L/A

R = Resistance  of wire

ρ = Resistivity of wire

L = Length of wire

A = Cross sectional Area  of  wire

Resistivity of wire is a material property and does not depend upon dimensions of conductor  

Resistivity Vary with ambient temperature but thats not mentioned here hence to be ignored

Hence Increasing decreasing length will not make any change in resistivity.

Resistivity will remains same .

If Question is about Resistance

then R = ρ L/A

New L' = 2L

As volume is constant and Volume = Area * Length

=> AL = A'L'

=> AL = A' 2L

=> A' = A/2

R' = ρ L'/A'

=> R' = ρ2L/(A/2)

=> R' = 4ρ L/A

=>  R' = 4R

Hence Resistance becomes 4 times

but Resistivity remains same.

Learn More:

A piece of wire is doubled on itself as shown.Its resistance increases ...

https://brainly.in/question/17713681

A 180 cm long wire is formed into a rectangle.if the width of this ...

https://brainly.in/question/14126299