Correct Answer - Option 4 : 5000 m

**Given:**

Dimensions of metallic slab = 35 × 11 × 20

Radius of wire = 0.7mm

**Formula:**

Volume of cuboid = l × b × h

Volume of cylinder = πr^{2}h

**Calculation:**

Volume of metallic slab = 35 × 11 × 20 = 7700 cubic.cm

Volume of cylindrical wire = 7700 cubic.cm

Radius of wire = 0.7mm = 0.07cm

But,

Volume of cylindrical wire = π × 0.7^{2} × h

⇒ 7700 = 22/7 × 0.07 × 0.07 × h

⇒ h = 500000 cm

⇒ h = 5000 m

**∴ Length of wire is 5000 m.**