Shear stress at neutral axis of the beam section is

Question

A wooden beam of rectangular cross – section 10cm deep by 5cm wide carries maximum shear force of 2000kgf. Shear stress at neutral axis of the beam section is

(a) Zero                                  (b)$40\frac{kgf}{cm^{2}}$

(c)$60\frac{kgf}{cm^{2}}$                              (d)$80\frac{kgf}{cm^{2}}$