If the size and direction of the torques acting on an object are exactly balanced, then there is no net torque acting on the object and the object is said to be in equilibrium.

What if the net torque is zero?

2) Rotational equilibrium: If the net torque acting on a body is zero, then the body is said to be in rotational equilibrium. In such a case, the angular velocity of the body remains constant.

When net torque is zero will be constant?

If the net torque is zero, then angular momentum is constant or conserved.