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Slip rings (also called a slip-ring commutator) are only used in AC motors. They maintain electrical contact between the coil (which spins) and the brushes (which don't). The current in the coil needs to change direction for the coil to keep spinning; DC motors (with a constant supply voltage)...

To score well in Physics you need to understand the underlying principles and learn to write concise answers using the correct terminology. It helps if you can discuss topics with someone who can find out your own current level of understanding and give you the missing pieces to help complete...