Question

Give Reason.
A spanner has long handle.​

Answer 1

because the turning effect of a body depends upon the perpendicular distance of the line of action of the applied force from the axis of rotation. Larger the perpendicular distance, less is the force required to turn the body. Therefore, spanner is provided with a long handle.

Answer 2

Torque is the product of length r and the force F. We apply force at the end of the spanner thus longer handle implies more r implying more torque for same force.