Question

please solve fast .....​

Answer 1

copper wire (cyl)

d=1cm

r=1/2cm

h=8cm

new wire

l=H=18m=1800cm

R=?

let R = x

vol of old wire=vol of new wire

pie×r²×h=pie×R²×H

cancels

r² ×h=R² ×H

1/2 ×1/2 ×8= x² ×1800

1/4×8=x²×1800

2=x²×1800

x²=2/1800

x²=1/900

x=1/30cm