is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is

[Srinivasan]

is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area
of cross section is and sectional modulus is . The maximum stress in the beam, subjected
to a maximum bending moment , is

(A) f = (P/A) + (Z/M)

(B) f = (A/P) + (M/Z)

(C) f = (P/A) + (M/Z)

(D) f = (P/A) + (M/6Z)

The correct Answer Is
(C) f = (P/A) + (M/Z)