Question

what are the situations in moment of inertia where Ix = Iy​

Answer 1

Ix = Iy when the x and y dimensions of the body are equal.

For example,

• a square has Ix = Iy as its length and breadth are equal
• a circular disc if we consider axis passing through its centre and perpendicular to its plane as z-axis
• a ring if we consider axis passing through its centre and perpendicular to its plane as z-axis
• a cylinder if we consider its natural axis as the z-axis