R}\)And MR = EI where,R= Radius of curvature of BEAM, M = Bending moment, E = Yong’s modulus, I = AREA moment of inertia,Here, EI = Flexural rigidityi.e. EI ∝ MFlexural rigidity is a measure of the resistance of a beam to bending, that is, the larger the flexural rigidity, the smaller the curvature for a given bending moment.