Strength of Materials Torsion of Shaft Moment of Inertia about Polar Axis

Select the correct statement regarding the 1^st and 2^nd moment of area of a circular lamina with radius ‘R’.

1

1^st moment of area is may be either –ve or +ve based on the chosen reference axes, but 2nd moment of area is always +ve.

2

1^st moment of area is always +ve and 2^nd moment of area is always −ve.

3

1^st moment of area is always −ve and 2^nd moment of area is always +ve.

4

1^st moment of area and 2^nd moment of area are always +ve.

5

Question Not Attempted

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