Question

Perpendicular axis theorem can be applied
for which of the following bodies?
o
Ring having radius R & negligible cross
section
O Disc of radius Rand thickness t
O Cylinder of radius R and height h
A cube of side 'a'
O Option 5​

Answer 1

Answer:

Perpendicular axis theorem is applicable only to planar bodies. The bodies which are flat with very less thickness or negligible thickness. Hence, this theorem is not applicable in case of sphere.

According to this theorem,

The moment of inertia of a planar body about an axis perpendicular to its plane is equal to the sum of its moments of inertia about two perpendicular axes lying in the plane of the body.

I

z

=I

x

+I

y

Hence, sphere is correct answer.