Question

find the resistance of 0.2m long copper wire of radius 0.2mm and resistivity=1.7×10^-8​

Answer 1

Answer:

Answer is 14.166

Explanation:

L=0.2

Area of the copper wire= (pi )multiply by (r^2)

now 0.2mm convert in meter=2×10^-4

now

( pi) ×(2×10^-4)^2

(pi)×(4×10^-8)

wo know that (pi)= 3.14

so we put a value

3.14×4×10^-8 = 1.2×10^-7

now we tke a formula

R=P×L/Aardvark

now put a values in formula

R=(1.7×10^-8) ×(100)/1.2×10^-7

R=(1.7×10^-6)/(.2×10^-7)

SO

R=14.166

i hope so it is correct and helpful for you