What does it really means to a condition of equilibrium i. e., if the body rotates about itself, without moving?
1
It means that there is a resultant force acting on it
2
It means that there is neither a resultant force nor a couple acting on it
3
It means that there is a single resultant couple acting on it with no resultant force
4
It means that there is a resultant force and also a resultant couple acting on it