Question

Why the steering wheel of a vecle is of large diameter

Answer 1

We know that torque produced in a body is directly proportional to magnitude of force applied and the perpendicular distance of line of action of force from the axis of rotation. 

If the perpendicular distance is minimum force needed is maximum

If perpendicular distance increase the magnitude of force neede to produce torque decreases

So a steering wheel has large diameter or we can say perpendicular distance . Therefore the force needed is less and it can be rotated easily and conveniently at sharp turns or any other situation to avoid accidents and chaos.

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Answer 2

It is easier to turn the steering wheel of a large diameter than that of a small diameter because less force is applied on the steering of large diameter which is at a large distance from the centre of the rim.