The moment of inertia of a sphere of mass M and radius R about an axis passing through its centre is 2/5 MR^2. The radius of gyration of the sphere about a parallel axis to the above and tangent to the sphere is

Q: The moment of inertia of a sphere of mass M and radius R about an axis passing through its centre is 2/5 MR^2. The radius of gyration of the sphere about a parallel axis to the above and tangent to the sphere is

(a) $\frac{7}{5} R$

(b) $\frac{3}{5} R$

(c) $ \sqrt{\frac{7}{5}} R$

(d) $ \sqrt{\frac{3}{5}} R$

Ans: (c)