Question

a resistance of 15 ohms is to be made out of 1 mm diameter copper wire. find out the length of the wire. The resistivity of copper is 0.01785 ohm meter​

Answer 1

resistance = p.l\a

15=0.01785*x/π(0.5*10^-3)^2

by simplifying.....

l=0.00065999845663651118455097meter