Torque and Centre of Gravity
Torque is also known as moment of force or couple. When a force acts on a particle, the particle does not merely move in the direction of the force but it also turns about some point. So, we can define the torque for a particle about a point as the vector product of position vector of the point where the force acts and with the force itself. In the given figure, balancing of a cardboard on the tip of a pencil is done. The point of support, G is the centre of gravity.
A body lying in a gravitational field is in stable equilibrium, if
Options:
(a) vertical line through CG passes from top
(b) horizontal line through CG passes from top
(c) vertical line through CG passes from base
(d) horizontal line through CG passes from base