A particle is going with constant speed along a uniform helical and spiral path separately as shown in figure

Options

A. The velocity of the particle is constant in both cases
B. The magnitude of acceleration of the particle is constant in both cases
C. The magnitude of acceleration is constant in (a) and decreasing in (b)
D. The magnitude of acceleration is decreasing continuously in both the cases

Answer

C

Explanation

`a_(c)=(v^(2))/r`, radius is constant in case (a) and increases in case(b). So that magnitude of acceleration is constant in case(a) and decreases in case(b)