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he was the one who proposed the plum pudding model and he was also the one who discovered the one of the subatomic particle which is the electron.
You are indeed correct that Torque is the product of force applied at an angle (but not just 90 degrees) to the lever arm at a distance from the pivot point. But we cannot just multiply 90 degrees to the equation. It is because there is a different torque applied to the lever arm even the force and the distance is still the same. Here's why:Torque formula
The equation for computing torque is described as
T = Torque (expressed in Nm)
F = Force applied to the lever arm
sin = trigonometric function sine
= the angle through which the force is applied
Sine is one of the trigonometric functions that is essential in solving physics problems like this one.
if the angle changes so as the torque even if the force applied and the distance from the pivot point did not change.
To solve your problem, we need to apply the said formula.
Keep in mind that we need to express the torque with the appropriate units which is Newton-meter (Nm). This is one of the common mistake made by students who forgot to place/write the appropriate unit to their solutions.
Now the torque on the lever is 30 Nm.
To understand more about Torque, Sine function and Unit for Force you may refer to these links.
Hope this helps!