Ferrofluids are used in loudspeakers to:

  1. amplify the signal
  2. store electricity
  3. produce the sound directly
  4. cool the voice coil and damp its vibrations
Answer

D) cool the voice coil and damp its vibrations

Held in the gap by the magnet. SLO P-09-E-09 · Understanding

Physics MCQ · More Magnetism and Electromagnetic Induction MCQs · Practise