State the principle of moments.

Figure below shoes the use of a lever. (a) State the principle of moments as applied to the above lever. (b) To which class of lever does it belong ? Give an example of this class of lever. (c) If FA=10 cm, AB=490 cm, calculate: (i) the mechanical advantage, and (ii) the minimum effort required to lift and load (=50N).

State the principle of potentiometer.

State the principle of potentiometer.

State the principle of a potentiometer.