Practice question

**Faraday's first law** emf induced when flux linking coil changes, second law magnitude proportional to rate of change, e = -dΦ/dt, for N turns e = -N dΦ/dt, flux Φ = B A cosθ, change can be due to B change, A change, or θ change, all produce emf. ω = 2π × (42/60) = 1.4π rad/s . ε = (1/2) B ω R² = (1/2) × 0.7 × 1.4π × (0.65)² = 0.623 V ≈ 0.62 V . Using Φ = B A cosθ, e = -N dΦ/dt = -N A dB/dt = B l v = N B A ω sinωt, L =