The stress developed in the direction of thickness is

Question

The state of plane stress in a plate of 100 mm thickness is given as  

Young’s modulus  = 300 N/mm²

Poisson’s ratio  =0.3

The stress developed in the direction of thickness is

(a) Zero                           (b) 90 N/mm²

(c) 100 N/mm²                     (d) 200 N/mm²