Discussion
Assertion (A): Material placed far from the neutral axis is disproportionately effective in bending.
Reason (R): Each element contributes its area times the square of its distance from the axis.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. Doubling the distance quadruples the contribution, which is why a spar consists of heavy caps joined by a light web and why a deep wing box is worth so much.
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