to increase friction
just for convenience
to convert static friction into kinetic friction
to convert kinetic friction into rolling friction
The function of the choke is to
The function of the commutator in a D.C machine is
The fundamental characteristic of all waves are
The fundamental scientific principle in the operation of battery is
The fuse in an electric circuit is connected in
The fuse in our domestic electric circuit melts when there is a high rise in
The gas thermometers is more sensitive than the liquid thermometre because gases
The group of solar cells joined together in a definite pattern is called a
The hair of shaving brush clings together when removed from water due to
The half-life of a radioactive substance depends upon