Why is a rectangular coil used in an Electric Generator instead of a circular coil?

Explanation:

when we use a circular coil, the magnetic field will always be perpendicular to the area vector. thus , due to this , sin wt gives sin 90° and that gives one, giving maximum linking of flux associated with the coil at any position.

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

what is the actual question though?