Internal and external radii of a thick cylinder are a and b. It is subjected to an internal pressure of pi. The radial stress at a radius r in the cylinder is

\(\frac{{{b^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{a^2}}}{{{r^2}}}} \right)\)

\(\frac{{{a^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{a^2}}}{{{r^2}}}} \right)\)

\(\frac{{{a^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{b^2}}}{{{r^2}}}} \right)\)

\(\frac{{{b^2}{p_i}}}{{{b^2} - {a^2}}}\left( {1 - \frac{{{b^2}}}{{{r^2}}}} \right)\)

Internal and external radii of a thick cylinder are a and b. It is sub

1.	Internal and external radii of a thick cylinder are a and b. It is subjected to an internal pressure of pi. The radial stress at a radius r in the cylinder is
A.	\(\frac{{{a^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{a^2}}}{{{r^2}}}} \right)\)
B.	\(\frac{{{a^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{b^2}}}{{{r^2}}}} \right)\)
C.	\(\frac{{{b^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{a^2}}}{{{r^2}}}} \right)\)
D.	\(\frac{{{b^2}{p_i}}}{{{b^2} - {a^2}}}\left( {1 - \frac{{{b^2}}}{{{r^2}}}} \right)\)
Answer» C. \(\frac{{{b^2}{p_i}}}{{\left( {{b^2} - {a^2}} \right)}}\left( {1 - \frac{{{a^2}}}{{{r^2}}}} \right)\)

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Internal and external radii of a thick cylinder are a and b. It is subjected to an internal pressure of pi. The radial stress at a radius r in the cylinder is

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