The electrical signal from a seismometer is alternating because:

  1. the coil is AC powered
  2. the battery alternates
  3. the magnet rotates continuously
  4. the ground vibrates back and forth, reversing the relative motion
Answer

D) the ground vibrates back and forth, reversing the relative motion

Direction of induced e.m.f. reverses. SLO P-09-E-43 · Application

Physics MCQ · More Magnetism and Electromagnetic Induction MCQs · Practise