Two spheres joined by a rod: moment of inertia about the centre of one sphere

1. A.
   $\frac{2}{5}MR^2$
2. B.
   $\frac{5}{2}MR^2$
3. C.
   $\frac{5}{21}MR^2$
4. D.
   $\frac{21}{5}MR^2$

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1. A.
   $\frac{21}{5}{MR}^{2}$
2. B.
   $\frac{84}{5}{MR}^{2}$
3. C.
   $\frac{42}{5}{MR}^{2}$
4. D.
   $\frac{5}{21}{MR}^{2}$

Tap an option to check your answer.