A student pushes perpendicularly on the end of a spanner producing a torque about the nut

PHYSICS · Single correct · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

A student pushes perpendicularly on the end of a spanner producing a torque

\tau

about the nut. The applied force remains unchanged. If the initial perpendicular distance from the nut is

r

, which new distance will make the torque three times larger? (a)

9r

(b)

\dfrac{r}{3}

(c)

3r

(d)

\sqrt{3}\,r