X Did you find all possible angles?

$($a$)$ What is the angle between the directions of vec$($r$)$ and vec$($F$)$ if the magnitude of the associated torque equals $0$N$*$m $?$

$0\backslash$deg

Greater than $0\backslash$deg but less than $90\backslash$deg

$90\backslash$deg

Greater than $90\backslash$deg but less than $180\backslash$deg

$180\backslash$deg