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3. | 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) | |