# Gravitational Field From Ring Mass

1. Nov 8, 2011

### edgepflow

Most introductory physics text books derive the following formula for the gravitational field for a point mass on the on the axis of the ring:

$g_{x}$ = -$\frac{Gmx}{(x^2 + a^2)^{1.5} }$

where,

m = total mass of ring
x = distance from point mass to ring center