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JAMB Physics 1981 Question 34

Question 34

Electromagnetic Induction

Alternating current can induce voltage because it has a

  1. A.ripple value
  2. B.varying magnetic field
  3. C.weaker magnetic field than direct current
  4. D.stronger magnetic field than direct current
  5. E.high peak value
Show the answer and explanation

Answer: B (varying magnetic field)

Explanation

An e.m.f. is induced only when magnetic flux changes. An alternating current produces a constantly changing magnetic field.