3, one method to induce an emf or
current in a loop is through a change in the
loop’s orientation or a change in its effective area As the coil rotates in a magnetic field B, the
effective area of the loop (the face perpendicular
to the field) is A cos q, where q is the angle
between A and B This method of producing a
flux change is the principle of operation of a
Rationalised 2023-24
Electromagnetic
Induction
171
simple ac generator An ac generator converts mechanical energy into
electrical energy