Question

the resisitor of conducting wire is x of length 1 m is 5ohm calculate the resistor of wire made by a same material whose length is 4 times ans area of cross section is 5 times that the wire x(at same temperature)​

Answer 1

Answer:

the resistance is 0.4 times the initial resistance

Explanation:

if R=ρl/a--(1)

length is four times l'=4l

area of cross-section is 5 times a'=5a

then R'=ρ4l/5a

R'=0.4ρl/a--(2)

from 1 and 2 R'=0.4R