In a d.c. motor, the coil is linked to a commutator. As the commutator turns, it joins the coil to the power supply. After each half-turn, the current in the coil reverses. What is the commutator called, and what is the orientation of the plane of the coil at the moment the current reverses?
- Aslip ring, parallel to the magnetic field
- Bslip ring, perpendicular to the magnetic field
- Csplit ring, parallel to the magnetic field
- Dsplit ring, perpendicular to the magnetic field