Page 274 - Basic Electrical Engineering
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of turns of the coil, the flux linkage by the coil, i.e., the amount of flux
passing through the coil will be (Nϕ) Webers. When the coil rotates, there is a
change in the flux linkage. The induced EMF ‘e’ is the rate of change of flux
linkage which can be expressed as
e = −d/dt (Nϕ) = −N dϕ/dt V
Figure 3.2 EMF induced in a coil rotated in a magnetic field. (a) Maximum flux linkage but
minimum rate of change of flux linkage; (b) same as in (a); (c) the coil has rotated by an angle θ from
its vertical position increasing the rate of change of flux linkage
