Question

A point mass m is placed inside a spherical shell of radius R and mass M at a distance from the centre of the shell. The gravitational force exerted by the shell on the point mass is.

• A. $\frac { \mathrm { GMm } } { \mathrm { R } ^ { 2 } }$
• B.
• C. Zero
• D. $\frac { 4 \mathrm { GMm } } { \mathrm { R } ^ { 2 } }$

Answer 1

Answer: (C)

Zero

Answer 2

If point mass is placed inside a uniform spherical shell, the gravitational force on the point mass is zero. Hence, the gravitational force exerted by the shell on the point mass is zero.