=0.1s Coil turned from θ=0 to 180∘ The expression for the change in flux is, ∆θ=θf−θi ∆θ=NBA‌cos‌180∘−NBA‌cos‌0∘ ∆θ=−2NBA The emf induced is, E=−‌
∆θ
∆t
E=−(‌
−2NBA
∆t
) E=‌
2NBA
∆t
Substitute the values in the above equation. E=‌