Q. A shell of mass $M$ and radius $R$ has a point mass $m$ placed at a distance $r$ from its centre.
A) [image:8_image6.emf]
B) [image:8_image7.emf]
C) [image:8_image8.emf]
D) [image:8_image9.emf]
Explanation
(b) $U_{(r)} = \left\{ \frac{- \frac{GMm}{r},r \geq R}{- \frac{GMm}{R},r < R} \right.\ $
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.