You are given a length of copper wire with a small diameter. The only measurement you have is a metre ruler.how do you measure the diameter of the ruler as accurately as you can.
The solution is simple.Firstly, twirl the copper wire around a pencil as tightly as possible. (leaving no gaps in between each coil) Measure the length of the pencil covered by the wire and count the number of coils round the pencil. Divide the length of the pencil by the number of coils. 'Ta Da' ! Isn't it easy?!?!?!
