Question

Find the resistance of 1 kg long copper wire of radius 2 mm

Answer 1

here is your answer ,

We know that ,
R = length / Area

so area = 2 × 22/7 × 2
= 12.6m^2
now ,
R = 1/ 12.6
R = 0.07ohm



i think its right .
hope its help✌