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JAMB Physics 1991 Question 43

Question 43

Electromagnetic Induction

If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes

  1. A.inductance
  2. B.eddy currents
  3. C.electro-magnetism
  4. D.dipole moment
Show the answer and explanation

Answer: B (eddy currents)

Explanation

The changing magnetic flux also induces currents that circulate in the metal frame itself; these are eddy currents.