The shear stress at a fibre in a section of beam is given by which of the following equation?
(where, F = shear force acting at a given section, A = area of the section above the fibre, y = distance of the C.G. of the area A from the N.A., I= moment of inertia of whole section about N.A. (Neutral Axis), b= actual width at the fibre.)
1
\(\rm \tau=\frac{F \times A \bar{y}}{I \times b^{2}}\)
2
\(\rm \tau=\frac{F \times A \bar{y}}{I \times b}\)
3
\(\rm \tau=\frac{F \times A \bar{y}}{I^{2} \times b}\)
4
\(\rm \tau=\frac{F \times \bar{y}}{I^{2} \times b \times A}\)