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_
Related questions
Induction is greater in a coil whenIn a transformer the primary and secondary coils are usually wound aroundThe d.c. motor uses which rule to predict the direction of rotation?In Fleming's left-hand rule the thumb representsThe strength of an electromagnet can be increased byAn electromagnet differs from a permanent magnet because itA step-down transformer with 1000 primary turns and 100 secondary turns connected to 220 VA step-up transformer has