Question

Keeping volume constant, A wire of resistance R is pulled to five times of it`s actual length, then it`s new resistance will be

5R

10R

20R

25R
​

Answer 1

Answer:25 R

Initial

Given resistance =R

Length=l

Area=A

Resistance=rhoxl/A

Final

Resistance=Y

Length=5l

Area=A/5

Y=rhox5lx5/A

=25 R

Answer 2

Answer:

Hey mate here is your answer

Explanation:

Answer is 25R