2 Answers

The principle of operation of an induction coil is based on…

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PHYSICS

The principle of operation of an induction coil is based on ___

A. Ohm’s law

B. Ampere’s law

C. Faraday’s law

D. Coulomb’s law

QUICK ANSWER…

C

DETAILS…

An induction coil is simply an electrical device that contain two coils similar to a transformer.

An induction coil takes in periodically interrupted DC current to induce a magnetic field around its primary coil, this magnetic field then induces an AC current on the secondary coil.

Faraday’s first law of electromagnetic induction explains that a changing magnetic field will induce an e.m.f in a conductor placed in its field.

This is exactly what happens in an induction coil. When current is made to flow in its primary coil, the magnetic field induced will create an e.m.f in the secondary coil.

Now for the right answer to the above question:

  1. Option A is incorrect. ohm’s law states that the voltage across a conductor is directly proportional to the current passing through it, it is not involved here.
  2. Option B is incorrect. Ampere’s law which concerns loop current is not involved here.
  3. C is correct. faraday’s first law of electromagnetic induction states that an e.m.f will be induced in a conductor if it is placed in a varying magnetic field. This is exactly what happens when an induction coil is under operation.
  4. D is not the correct answer. Coulomb’s law is a law that seeks to calculate the force of attraction or repulsion between two charges separated by a distance. This is not applied in induction coils.
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KEY-POINTS…

You may please note these/this:

  • Faraday’s first law simply states that when a conductor is placed in a changing magnetic field, current will start flowing in the conductor.
  • Induction coil operation involves secondary coil placed in the magnetic field induced by the primary coil to create an e.m.f in the secondary coil.
  • Induction coils are used in ignition engines as part of the ignition system to fire spark plugs.

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/ culled from 2016 JAMB-UTME physics past question 31 /

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