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Question
The ratio of Moment of Inertia about the neutral axis to the distance of the most distant fibre of the section from the neutral axis is called
A.
Moment of Inertia
B.
Polar Moment of Inertia
C.
Section Modulus
D.
Modulus of elasticity
Answer ( Option C)

Section Modulus

Solution

Where, 
INA = Moment of Inertia about neutral axis (NA)
Y= Distance of extreme fiber from neutral axis (NA)
Note:-
• The higher the value of section modulus for a particular cross-section, the higher the bending moment which it can withstand for a given maximum stress.
• The unit of Section Modulus (Z) is (length)3 i.e. (mm)3

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