This question involves the concepts of the torque, moment of couple and moment arm.
The magnitude of the torque of the couple on the ruler is "0.38 N.m".
The torque produced by the couple also known as moment of couple is given by the following formula:
[tex]Torque=T=(Force)(Moment\ Arm)[/tex]
where,
moment arm = perpendicular distance between line of action of both forces = (0.3 m)Cos 50° = 0.19 m
Therefore,
[tex]T=(2 N)(0.19\ m)[/tex]
T = 0.38 N.m
Learn more about moment of couple here:
https://brainly.com/question/24551104?referrer=searchResults
The attached picture shows moment of couple.
