If the coefficient friction between A and B is μ , the maximum acceleration of the wedge A for which B will remain at rest with respect to the wedge is

For maximum acceleration body as a tendency to go up and friction acting down the plane.macosθ=mgsinθ+fmacosθ=mgsinθ+μmasinθ+mgcosθa=g+μa+g            θ=45oa=g1+μ1−μ