Find rm, the length of the moment arm of the force. express your answer in terms of l and θ.

rm = r sin θ

τ = -r sin θ F

Torque (moment of force) with respect to the pivot point P is defined as the product of the magnitude of the force F and the moment's arm

The torque can be clockwise or counterclockwise (counterclockwise marked +, clockwise marked -)

For objects with 2 or more forces, the total torque is:

From pictures attached

τ = -rm  x F

rm = (arm force which is perpendicular to the work line)

⇒ negative sign because the torque is clockwise  to the point P

while the magnitude of the arm force rm:

rm = r sin θ

tangential force

link

static equilibrium

 link

Newton's Law

link

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

small = small current large mag large current