SSE JE Electrical Engineering 24-March-2021 Shift 2 Paper

P = Number of poles = 6
N = Total turns = 6 × 500 = 3000 (since 500 turns per pole in series)
Total initial flux = 6 × 0.02 = 0.12 Wb. (since number of poles is 6)
Total residual flux = 6 × 0.002 = 0.012 Wb
Change in flux, dϕ = 0.12 - 0.012 = 0.108 Wb
Time of opening of circuit, dt = 0.02 second
From concept,
Induced EMF (E) =3000×

0.108

0.02

=16,200V