Engine 2014: Electricity

1. A the field strength varies directly with rotor slip
2. B the DC current applied to the rotor coils causes the rotor magnets to lock in with the rotating magnetic flux of the stator
3. C the stator poles are dragged around due to the magnetic flux created by the excitation current
4. D the stator magnetic flux rotates in the opposite direction

Tip: press A-D to answer