Discussion
Assertion (A): Simple bending theory may be applied directly to an unsymmetric section.
Reason (R): The neutral axis of any section in bending passes through the centroid.
Select the correct answer from the options below.
Answer: A
The assertion is false while the reason is true. The neutral axis does pass through the centroid whatever the symmetry, but for an unsymmetric section it is not perpendicular to the applied moment, so the simple formula gives the wrong stress and the general expression must be used.
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