Which one of the following plots represents the variation of the gravitational field on a particle with distance r due to a thin spherical shell of raduis R? (r is measured from the centre of the spherical shell).

Which one of the following plots represents the variation of the gravi

1.	Which one of the following plots represents the variation of the gravitational field on a particle with distance r due to a thin spherical shell of raduis R? (r is measured from the centre of the spherical shell).
Answer» Solution :Gravitational field due to the thin SPHERICAL SHELL. Inside the shell, F = 0 (for `rltR`) On the surface of the shell, `F=(GM)/(r^2)` (for r = R) OUTSIDE the shell, `F=(GM)/(r^2)` (for `rgtR`) The variation of F with distance r from the centre is as SHOWN in the FIGURE (b).