It is found that an alternating induced emf is produced in a coil when a bar magnet was rotated at a constant speed in front of it. Use properties of a bar magnet, and Faraday's law to explain the physics behind this observation. Explain clearly.
Constants and equations
Speed of sound at 0°C: $V_0 = 331.4 \text{ m/s}$;
Speed of light in empty Space, $C = 3.0 \times 10^8 \text{ m/s}$
Plank's Constant, $h = 6.626 \times 10^{-34} \text{ J.s}$
Refractive index of air, $n_{air} = 1$
$1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}$
Specific heat capacity of liquid water, $C = 1 \text{Cal/g°C}$
Electrical Heat Equivalent, $EHE = 4.18 \text{ J/Cal}$
Linear regression: $y = mx + b$
$V_s = f \lambda$; $V_s = V_0 + 0.61T_c$; $Ln = n \lambda_n$, where $n = 1, 3, 5,...$
$E = VIt$; $Q = mc \Delta T$; $E(J) = EHE(J/Cal)Q(Cal)$;
$V = \frac{\lambda}{T} = \lambda f$
