Suppose two asteroids, with a mass m$1=(6\mathrm{.}875$x$10^7)$ kg and m$2=(3\mathrm{.}83$x$10^7)$ kg$,$ each carry a net negative charge $$Q$.$ The asteroids are separated by $(1\mathrm{.}1499$x$10^11)$ m$.$Approximate both bodies as point masses and point charges.

What value of Q is required to balance the gravitational attraction between the two asteroids?$$