A ring of mass 0.3kg is threaded on a fixed, rough, horizontal curtain pole. A light inextensible string is attached to the ring. The string and the pole lie in the same vertical plane. The ring is pulled downwards by the string which makes an angle "A" to the horizontal, where tan A=3/4. The tension in the string is 2.5N. The ring is in equilibrium. This question doesnt seem that difficult, but in which direction does the normal contact force act?