Formula used :

Resistance of a wire is given by

Resistance,

Where

ρ→ resistivity of the material

l→ length of the wire

A → cross sectional area of the wire

l is proportional to R.

When a uniform wire of resistance 50Ω is cut into 5 equal parts then resistance of each part is

10 Ω.

Now they are connected in parallel.

Equalent resistance is calculated as

Ω

A uniform wire of resistance 50 Ω is cut into 5 equal parts. If the parts are connected in parallel then equivalent resistance is Ω. So option A is correct.