The vertical stress at point P1 due to the point load Q

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The vertical stress at point P₁ due to the point load Q on the ground surface as shown in figure is σ_z. According to Bossiness's equation, the vertical stress at point P₂ shown in figure will be

1. σ_z/2
2. σ_z
3. 2σ_z
4. 4σ_z

Correct Option: D

Bossiness's equation
Vertical stress