There are three identical point mass bodies each of mass `m` locted at the vertices of an equilateral triangle with side `r`. They are experting gravitational force of attraction on each other, which can be given by Newton's law of gravitaiton. Each mass body produces its gravitational field in the surrounding region. the magnitude of gravitational field at a point due to a point mass body is the measure of gravitaitonal intensity at that point. The gravitational potential at a point in a gravitational field is the amount of workdone in bringing a unit mass body infinity to the given point without acceleration.

Answer the following questions :
At what speed must they move if they all revolve under the influence of one another's gravitation in a circular orbit circumsribing the triangle still preserving the equilateral triangle

Options

A. `(Gm)/(r )`
B. `sqrt((2Gm)/(r ))`
C. `sqrt((Gm)/(r ))`
D. `sqrt((3Gm)/(r ))`

Answer

C

Explanation

Here, `CO = (2)/(3) CD = (2)/(3)AC sin 60^(@)`
`= (2)/(3)r xx (sqrt(3))/(2) = (r )/(sqrt(3))`
When each body is describing a circular orbit with centre at `O`, the force `F` provides the required centripetal force. If `upsilon` is the speed of the body in circular orbit, then
`(m upsilon^(2))/((r//sqrt(3))) = (sqrt(3) Gm^(2))/(r^(2))` or `upsilon = sqrt((Gm)/(r ))`