Question

Answer me 6 question
I'll mark it as a brainlist answer
plz..don't DELAY
I'll mark it ​

Answer 1

✔✔✔I HOPE ITS HELP YOU✔✔

Answer 2

the diameter of the copper wire is 0.5mm

so

r=.25

resistivity=1.6×10^-8

resistance =10

so by using formula we get

10=1.6x10^-8×l/.25

by sustituting we get

l=1562500mm

now if radius is doubled

10=1.6×10^-8×l/0.5

now substitute we get the answer as

l=312500mm


sorry instead of radius plz use the area of the circle by using the formula
2 pi r