Discussion
Assertion (A): The shear flow in an open section can be found from equilibrium alone.
Reason (R): There is a free edge at which the shear flow is known to be zero.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second explains the first. The known starting value makes the problem determinate, so the flow follows by integrating the first moment of area round the section. A closed section has no such edge and needs a compatibility condition.
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