When a mass is rotating in a plane about a fixed point , its angular momentum is directed along

Options

A. a line perpendicular to the plane of rotation
B. the line making an angle of `45^(@)` to the plane of rotation
C. the radius
D. the tangent to the orbit

Answer

A

Explanation

Let x be the distance of centre O of equilateral triangle from each side . Total torque about O = 0
`implies F_(1) x + F_(2) x- F_(3) x = 0` or `F_(3) = F_(1) + F_(2)`