where G=universal gravitational constant
O=center
m=mass of particle A
F=force of attraction of a shperical shell on a particle A
h=radius of shell
u=mass per unit area
K=P.A
where G=universal gravitational constant
O=center
m=mass of particle A
F=force of attraction of a shperical shell on a particle A
h=radius of shell
u=mass per unit area
K=P.A