b
Diameter of the cones at the narrow ends, \(d=0.50 mm =0.5 \times 10^{-3} m\)

Radius, \(r=\frac{d}{2}=0.25 \times 10^{-3} m\)

Compressional force, \(F=50000 N\)

Pressure at the tip of the anvil

\(p=\frac{\text { Force }}{\text { Arear }}=\frac{F}{\pi r^{2}}\)

\(=\frac{50000}{\pi\left(0.25 \times 10^{-3}\right)^{2}}\)

\(=2.55 \times 10^{11} Pa\)

Therefore, the pressure at the tip of the anvil is \(2.55 \times 10^{11} \;Pa\)