Consider macroscopic object (a ball for instance) which has angular momentum equals 0. Now single electron hits the ball and is absorbed by it. Let's assume it hits in direction perpendicular to tanget plane to the point of hit.
As an electron is quantum of angular momentum, the total angular momentum of composite system (ball and electron) must change due to conservation of angular momentum.
As angular velocity of macroscpic object is proportional to its angular momentum the ball should start rotating (although very slowly due to small amount of momentum carried by electron and large moment of inertia of ball).
Is this true? And if so, how is it possible to rotate an object using non-rotating particle (electron)?
This question is perhaps naive and maybe I miss something, but I would be grateful for explaining this.