A body moves with constant angular velocity on a circle. Magnitude of angular acceleration is:

Explanation

Explanation is given below. If a body moves with constant angular velocity on a circle, then its angular acceleration is zero. This is because acceleration is defined as the rate of change of velocity with respect to time. In circular motion, the velocity of the body is constantly changing as it moves around the circle, but the magnitude of the velocity remains constant. Therefore, the angular acceleration of the body is zero. Mathematically, we can express this as: Angular acceleration (α) = dω/dt where ω is the angular velocity of the body. Since the angular velocity is constant, the derivative of ω with respect to time is zero, so the angular acceleration is also zero.