For a beam of uniform flexural rigidity, curvature is proportional to

Why is this the answer?

For a beam with uniform flexural rigidity EI, the curvature κ = M/EI, where M is bending moment and EI is flexural rigidity. Curvature is directly proportional to bending moment (higher M → greater curvature). This is the basis of the Euler-Bernoulli beam theory used in structural analysis.

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