**Gravitational Field**

**For a point mass M**

Gravitational force on the mass m_{o}at P

Gravitational field intensity at P due to M.

is the unit vector radically inward towards O.

So, gravitational field lines for a point mass are radically inward straight lines

e.g., Two point masses B and A each mass M are kept at (0, a) and (a, 0) respectively.

Find the gravitational field at (0, 0).

Gravitational field intensity due to A at origin

Gravitational field intensity due to B at origin

Applying principle of superposition, net gravitational field**Spherical shell of mass M, radius R**- At a point outside of shell (r > R)

(Total mass is assumed to be concentrated at the centre) - At a point on the surface (r = R)
- At a point inside the shell (r < R)

No field line exist inside the shell variation of gravitational field (l) versus distance (r) from centre

- At a point outside of shell (r > R)

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