Question

Q2.A wire of length L and resistance R is stretched so that it's length is doubled and the area

of cross section is halved. How will it's :

(a)resistance change?

(b)resistivity change?​

Answer 1

Answer:

when wire is stretched

length of wire =2L

area of cross section=A/2

let the new resistance be R*

Explanation:

so the new resistance became 4 time

resistivity remain same for same material