Basic angular acceleration question?

Question

A disk is free to rotate about an axis. A force applied a distance d from the axis causes an angular acceleration α. What angular acceleration is produced if the same force is applied a distance 4d from the axis?

______ x α

Answer 1

This is NOT a centripetal acceleration problem.

Angular acceleration is proportional to the torque applied and the torque is proportional to the radius, so clearly

α' = 4*α

Answer 2

see below.