If a beam of rectangular cross-section is subjected to a

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If a beam of rectangular cross-section is subjected to a vertical shear force V, the shear force carried by the upper one-third of the cross-section is

1. zero
2. 7V/27
3. 8V/27
4. V/3

Correct Option: B

Variation of shear stress,

τ =	V.Ay
	lb

Taking a height y from N. A.