Question

What will be the direction of angular momentum when a particle moves in circular path with decreasing speed?

Answer 1

angular momentum = P×R

here p is linear momentum of particle.

so direction of angular momentum perpendicular of both.

Answer 2

The angular momentum of a particle of mass m moving with velocity υ⃗ 
along a circular path of radius r is given by 

L⃗ =r⃗ ×p⃗ =r⃗ ×mυ⃗ 

When the speed υ decreases, the magnitude of angular momentum decreases. But the direction of angular momentum remains unchanged.

hope it helps you...