Two concentric shells have masses `M` and `m` and their radii are `R` and `r`, respectively, where `R gt r`. What is the gravitational potential at their common centre?

Two concentric spherical shells A and B of radii R and 2R and mases 4M , and M , respectively are placed in space as shown in Fig. The gravitational potential at P at a disatnce r(R lt r lt 2R) from the centre of shells 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 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 conducting shells of radii R and 2R are having charges Q and -2Q respectively.In a region r

Two concentric spheres kept in air have radii R and r. They have similar charge and equal surface charge density sigma . The electrical potential at their common centre is (where, epsi_(0) = permittivity of free space)

Two concentric spheres kept in air have radii R and r. They have similar charge and equal surface charge density sigma . The electrical potential at their common centre is (where, epsi_(0) = permittivity of free space)

Assertion : Two spherical shells have masses m_(1) and m_(2) . Their radii are r_(1) and r_(2) . Let r be the distance of a point from centre. Then gravitational field strength and gravitational potential both are equal to zero for O lt r lt r_(1) Reason : In the region r_(1) lt r lt r_(2) , gravitational field strength due to m_(2) is zero. But gravitational potential due to m_(2) is constant (but non-zero).

Assertion : Two spherical shells have masses m_(1) and m_(2) . Their radii are r_(1) and r_(2) . Let r be the distance of a point from centre. Then gravitational field strength and gravitational potential both are equal to zero for O lt r lt r_(1) Reason : In the region r_(1) lt r lt r_(2) , gravitational field strength due to m_(2) is zero. But gravitational potential due to m_(2) is constant (but non-zero).

There is a concentric hole of radius R in a solid sphere of radius 2R. Mass of the remaining portional is M. What is the gravitational potential at centre?

There is a concentric hole of radius R in a solid sphere of radius 2R. Mass of the remaining portional is M. What is the gravitational potential at centre?