Question

if a wire of resistance R is melted and recast to half of its length then the new resistance would be ​

Answer 1

Explanation:

HEY MATE HERE IS YOUR ANSWER

As resistance is directly proportional to length and inversely proportional to cross sectional area, hence resistance will become one fourth of the original.

HOPE IT HELPS YOU

PLEASE MARK ME IT AS BRAINLIST PLEASE

Answer 2

Initially ,

R =pL/A

here,

R=resistance

p=resistivity

L=length

A =area of cross section

Now ,

On melting new length becomes half of it's initial length

L' =L/2

So the area of cross section doubles

A '= 2A

R ' = p L/4A

R '= R/ 4