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In an a.c. generator, the slip-rings serve to

ACool the coil and prevent overheating
BReverse the current every half cycle in the coil
CGenerate the magnetic field used by the coil
DConnect the rotating coil to the external circuit
Answer & Solution
Correct answer: D. Connect the rotating coil to the external circuit
1. The a.c. generator does not need to reverse current (unlike d.c.). 2. Slip-rings are continuous rings on the rotating shaft. 3. Carbon brushes ride on them and connect to the external circuit. 4. So option A is correct. _Source: Selina Concise Physics Class 10, Ch 10 Electromagnetism (Mistral OCR'd PDF), section on ac generator_
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