Two concentric shells of mass `m_(1)` and `m_(2)` are situated as shown. Find the force on a particle of mass `m` when the particles is located at `(a) r=r_(1),(b)r=r_(2),(c)r=r_(3)`. The distance `r` is measured from the centre of the shell.

Two concentric spherical shells have masses m_(1) , m_(2) and radit R_(1) , R_(2) (R_(1) lt R_(2)) . Calculate the force by this system on a particle of mass m , if it is placed at a distance ((R_(1) + R_(2)))/(2) from the centre.

Two concentric spherical shells have masses m_(1) , m_(2) and radit R_(1) , R_(2) (R_(1) lt R_(2)) . Calculate the force by this system on a particle of mass m , if it is placed at a distance ((R_(1) + R_(2)))/(2) from the centre.

Two concentric spherical shells of masses and radii m_(1), r_(1) and m_(2), r_(2) respectively are as shown. The gravitational field intensity at point P is

Two concentric spherical shells of masses and radii m_(1), r_(1) and m_(2), r_(2) respectively are as shown. The gravitational field intensity at point P is

Two concentric spherical shells have masses m_(1) and m_(2) and radii r_(1) and r_(2) (r_(2) gt r_(1)) . What is the force exerted by this system on a particle of mass m_(3) . If it is placed at a distance r(r_(1) lt r lt r_(2)) from the centre ?

Two concentric spherical shells have masses m_(1) and m_(2) and radii r_(1) and r_(2) (r_(2) gt r_(1)) . What is the force exerted by this system on a particle of mass m_(3) . If it is placed at a distance r(r_(1) lt r lt r_(2)) from the centre ?

Two concentric shells of masses M_(1) and M_(2) are having radii r_(1) and r_(2) . Which of the following is the correct expression for the gravitational field at a distance r ?