A straight wire of resistance R is bent in a U shape. Its resistance is:

R

Reason — The resistance of a wire is given by

$\text{R} = \rho\frac{l}{a}$

i.e., it depends on the resistivity of the material, the length of the wire and its area of cross-section.

On bending the wire into a U shape, neither its length, nor its area of cross-section, nor its material changes. Hence its resistance remains R.