Theory of Structures
At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by

Maximum compressive stress at the section
Depth of the neutral axis
Maximum tensile stress at the section
Depth of the section

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Theory of Structures
A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm²and that of brass bar is 3000 mm². These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm² and Eb = 0.1 MN/mm², the stresses developed are:

b = 8 N/mm² s = 16 N/mm²
b = 10 N/mm² s = 20 N/mm 2
b = 6 N/mm² s = 12 N/mm²
b = 5 N/mm² s = 10 N/mm²

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