Induction current conditions?
According to Faraday’s law: the electromotive force of the EMF induction is directly proportional to the rate of change in the magnetic flux ΔF / t.
EMF = – ΔФ / t, where ΔФ is the change in the magnetic flux, t is the time of the change in the magnetic flux.
The magnetic flux is determined by the formula: Ф = B * S * cosα, where B is the magnetic induction of the field, S is the area of the contour, ∠α is the angle between the normal to the plane of the frame and the magnetic induction B.
EMF = – Δ (B * S * cosα) / t.
It can be seen from the formula that induction current occurs in 3 cases:
1 – the frame is in an alternating magnetic field;
2 – the area of the contour changes;
3 – the angle ∠α between the normal and the magnetic induction B changes, the frame rotates.
Also, an induction current occurs in a conductor that moves in a magnetic field.
EMF = V * B * l * sinα, where V is the speed of the conductor, B is the magnetic induction, l is the length of the conductor, ∠α is the angle between V and B.
