try

I'm posting a general method, you may work out different situations from here.

This question basically is from constraints.

Figure shows acc. at different points. After finding acc., it is easy to find force.

Case 1: Disk slips at A but not at B (hope you know the relation b/w slipping and friction)

a sinθ=a_{perpendicular}
X_perp=X_surface=0

Case 2: Disk slips at B but not at A

-a cos θ= a_incline
a sinθ=a_{perpendicular}
X_perp=0

Case 3:

Disk slips at A and B

a sinθ=a_{perpendicular}
X_perp=0

Case 4: Slips nowhere

-a cos θ= a_incline
a sinθ=a_{perpendicular}
X_perp=X_surface=0

the question is about normal reaction at A AND B.

CAN U POST THE SOLUTION.