The moment of inertia of a uniform cylinder of length $l$ and radius $R$ about its perpendicular bisector is $I$. What is the ratio $l/R$ such that the moment of inertia is minimum ?

Question

( A ) $1$
( B ) $\frac{3}{\sqrt{2}}$
( C ) $\frac{\sqrt{3}}{2}$
( D ) $\sqrt{\frac{3}{2}}$