A brass billet is to be extruded from its initial diameter

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A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of 50 mm. The working temperature of 700°C and the extrusion constant is 250 MPa. The force required for extrusion is

1. 5.44 MN
2. 2.72 MN
3. 1.36 MN
4. 0.36 MN

Correct Option: B

R =	A_i
	A_f

F = 250 × 10⁶ ×	π	(0.1)² In		0.1		²
	4			0.05

F = 2.72MN