1. Motion  Current: Generating Electricity (Faraday’s law)
1. A current appears only if there is relative motion.
Fast motion produces a greater current.
3. Clockwise/counter clockwise current with north pole move in/out. Opposite with south pole.
Induced current in secondary coil, if there is change of current in the primary coil: switch or ac current
Transformer

2. Faraday’s Law of Induction
Magnetic flux through area A
Amount of magnetic field passes through an area A
For uniform B:
(Weber, or Wb, or T m2
Faraday’s Law of Induction: An emf is induced in a loop when the magnetic flux that pass through the loop is changing. The the loop is conducting, then a current will flow.
For a loop with N turns:
Change B (change current)
Change A
Change angle between them

3. Current loop in magnetic field: Motors•  B B F L  •  w

4. Torque on a Current Loop: MotorsF F  B •  F B •  B •  n  n n F

5. Torque on a Current Loop: ContinuousB •  F n B •  F  n B •  F n B •  F B •  F