Question

What will be the resistance o the wire when it isbfolded to half?

Answer 1

It becomes one fourth of the original.
R1 = ρ ℓ1 / A1 

R2 = ρ ℓ2 / A2 = ρ ½ ℓ1 / (2 A1) = ¼ ρ ℓ1 / A1 = ¼ R1 

Answer 2

It becomes one fourth of the original resistance