A uniform resistance wire is stretched till it's length becomes four times. What happens to the resistance ? *Plagiarised / Irrelevant answers will be reported!​

we have:

At unit length

Resistance [R]=.....i

where

p: resistivity

L:length

A:area

when

length is strength 4 times

length will be 4L

Now

new equation becomes

Resistance[R] ==4=4R

so

when A uniform resistance wire is stretched till it's length becomes four times. the resistance increases by four times of its original resistance.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

your answer is c! hope this : )