Q. The moment of inertia of a circular disc about one of its diameter is $I$. What will be its moment of inertia about a tangent parallel to the diameter?
A) $4I$
B) $2I$
C) $\frac{3}{2}I$
D) $3I$
Explanation
(d) The moment of inertia of a circular disc
$I = \frac{1}{2}MR^{2}$
According to theorem of parallel axes
$I^{'} = \frac{1}{2}MR^{2} + MR^{2} = \frac{3}{2}MR^{2} = 3I$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.