In a moving-coil loudspeaker, the cone vibrates because:

  1. sound pushes it
  2. the varying current in the coil experiences a varying force in the magnet's field
  3. air flows through it
  4. the magnet vibrates
Answer

B) the varying current in the coil experiences a varying force in the magnet's field

Motor effect. SLO P-09-E-29 · Understanding

Physics MCQ · More Magnetism and Electromagnetic Induction MCQs · Practise