A particle is revolving in a circle with increasing its speed uniformly. Which of the following is constant ?

Options

A. centripetal acceleration
B. tangential acceleration
C. angular acceleration
D. none of these

Answer

C

Explanation

Angular acceleration `(alpha) = (a_(t))/(r)`
Since, `|vec(a)_(t)|=(d|vec(v)|)/(dt)` = constant
`:.` magnitude of `alpha` is constant
Also its direction is always constant (perpendicular to the plane of circular motion)
whereas, direction of `vec(a)_(t)` changes continuously `vec(a)_(t)` is not constant.