The extreme stress at the top and bottom edges of a prestressed beam when tendons are placed along the longitudinal axis of the beam are

\(\frac{P}{Z} \pm \frac{M}{A}\)

\(\frac{P}{A} \pm \frac{M}{Z}\)

\(\frac{P}{A} \pm \frac{M}{I}\)

\(\frac{P}{I} \pm \frac{M}{A}\)

The extreme stress at the top and bottom edges of a prestressed beam w

1.	The extreme stress at the top and bottom edges of a prestressed beam when tendons are placed along the longitudinal axis of the beam are
A.	\(\frac{P}{A} \pm \frac{M}{Z}\)
B.	\(\frac{P}{Z} \pm \frac{M}{A}\)
C.	\(\frac{P}{A} \pm \frac{M}{I}\)
D.	\(\frac{P}{I} \pm \frac{M}{A}\)
Answer» B. \(\frac{P}{Z} \pm \frac{M}{A}\)