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Axisymmetry implies that points lying on the z- axis remains _____ fixed.

(a) Tangentially

(b) Spherically

(c) Radially

(d) Circularly

I have been asked this question during an online exam.

This is a very interesting question from Axis Symmetric Problem Modelling and Boundary Conditions in division Axis Symmetric Solids Subjected to Axis Symmetric Loading of Finite Element Method

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Right answer is (c) Radially

The explanation is: Axial symmetry is symmetry around an axis; an object is axially symmetric if its appearance is unchanged if rotated around an axis. Surface element may refer to an infinitesimal portion of a 2D surface, as used in a surface integral in a 3D space.

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