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An alternating current can induce voltage because…

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An alternating current can induce voltage because it has

  • A. Ripple value
  • B. Varying magnetic field
  • C. Weaker magnetic field than direct current
  • D. High peak value




Voltage is usually induced in a coil when there is a changing magnetic field close-by, in fact this is a compulsory condition for voltage to be induced. If the direction of the magnetic field is constant, no voltage will be induced. So, for a conductor carrying alternating current, because the direction of the current is alternating (changing), changing magnetic fields will equally be induced, this changing magnetic field will in turn induce another alternating current in another close-by conductor.

Now for the right answer to the above question:

  1. Option A is incorrect. the ripple value of AC is not used in inducing voltage.
  2. Option B is correct. voltages can only be induced in a conductor exposed to changing magnetic field.
  3. C is incorrect. ACs actually have stronger magnetic fields than DCs.
  4. D is not the correct answer. high peak value not the reason.


You may please note these/this:

  • So, the varying nature of the magnetic field induced by the AC is directly responsible for inducing another alternating voltage in a secondary near-by coil.
  • This is exactly what happens in an induction coil and transformer.

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/culled from 2019 JAMB-UTME physics question 27/

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