Question

Torque due to a force is maximum on a door if force is applied
(a) parallel to the door
(b) perpendicular to the door
(c) at 45° to the door
(d) at 60° to the door​

Answer 1

Hey

Your answer is (B)---- Perpendicular to the door

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Answer 2

b) perpendicular to the door.

We know that,

Torque = r F sin Φ

Torque will be maximum,

when sin Φ = max=+1 .

Therefore Φ = 90 ° i.e when the force is applied in a direction perpendicular to door the torque will be maximum.

hope it helps..