is the pre- stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on 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)
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