we place handles at maximum possible distance from the hinges in a door because torque is rotating effect of force.
It is calculated by formula :
τ = R × F
τ = R F sinθ , as R is large τ would be high .
The handles of the doors are at maximum distance from the hinges as it wants to make a perpendicular distance line of action of the force from hinges maximum.
This results in large torque at hinges and doors can be opened or closed easily.
